What are the opening hours?

Monday 9am - 9pm Tuesday 9am - 5pm Wednesday 9am - 7pm Thursday 9am - 9pm Friday 9am - 5pm Saturday 9am - 2pm Sunday 9am - 12pm

HYMB - Herts Young Mariners Base

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HYMB - Herts Young Mariners Base

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HYMB has been offering outdoor educational opportunities to both adults and young people from Hertfordshire and surrounding areas for over 50 years.

HYMB has been offering outdoor educational opportunities to both adults and young people from Hertfordshire and surrounding areas for over 60 years. From initially offering mainly watersports, over the past decade we have expanded in to other areas, for example caving, climbing and problem solving/team building activities. HYMB is in partnership with Youth Connexions Hertfordshire. HYMB can now accommodate up to 180 participants at any one time, whether school students, youth groups and clubs, HYMB members activities or corporate days for business’s. We offer a wide range of activities to both groups and individuals.

‘Youth Connexions takes eSafety very seriously however we cannot be held responsible for content on this page which is not posted by our own staff. We ask that users recognise that the views posted on this page are not necessarily those of Youth Connexions. Although we regularly monitor this page it is possible that comments may be posted for a short period before we get a chance to check them. Please report any inappropriate content to [email protected]. Your help in keeping the internet safe is appreciated.’

23/10/2026

Looking for a fun way to keep the kids entertained this autumn half-term? 👀

Our Holiday Club is packed with land and water activities that will have them splashing and laughing all day long! Open from 8.15am-3.15pm, with activities kicking off at 9:.30am. Perfect for ages 8 to 16.

Spots are filling up fast, so book now! ⬇️

https://brnw.ch/21x6CDA

14/10/2026

Winter Opening Hours at Herts Young Mariners Base!

The temperatures may be dropping, but the adventures don't have to stop!

As we move into the colder months, we're updating our opening hours so you can continue enjoying open water swimming and paddleboarding at our beautiful spring-fed lake.

Our Winter Opening Hours:

Wednesday: 5pm–8pm

Saturday: 7.30am–12pm

Sunday: 7.30am–12pm

Whether you're embracing the benefits of cold water swimming, enjoying a peaceful morning on the lake, or keeping active throughout the winter, we've got you covered!

Remember to wrap up warm, bring plenty of layers and enjoy everything the lake has to offer this winter.

Book your next session via the Better UK app or our website 👇

https://brnw.ch/21x6oUe

We look forward to welcoming you to the lake this winter! 👋

02/10/2026

With the nights closing in, HYMB are now running their openwater swimming sessions under flood lights. On Monday, Wednesday and Friday evenings from 4pm to 8pm.
There are hot drinks available to purchase upstairs in the main building.
Come and give it a go.

21/08/2026

Don't forget our Holiday Camps are run right through to the end of Summer!

8.30am-3.15pm

Herts Young Mariners Base
Ages 8–16 years

Give your child an unforgettable summer of outdoor adventure. Every day is packed with exciting, instructor-led activities designed to build confidence, develop new skills, and create lasting memories.

Activities include:

🧗 Rock Climbing
🛶 Kayaking
🏄 Paddleboarding
🚣 Open Canoeing & Bellboating
🏹 Archery
🧭 Orienteering
⛵ Raft Building
🕳️ Caving

Fresh air, new friends, exciting adventures, and plenty of fun await.

Spaces are limited and expected to fill quickly. Book today and secure your child's place for an action-packed summer.

Visit 👉 https://brnw.ch/21x567v

28/07/2026

Extended opening hours – For the next 6 weeks!

Make the most of summer with extended opening hours at Herts Young Mariners Base.

Whether you're enjoying an open water swim, heading out on a paddleboard, or relaxing by our beautiful spring-fed lake, we've got more time for you to enjoy it all.

Tuesday - Friday: 12:00pm - 8:00pm

Saturday and Sunday: 7:30am - 5:00pm

Don't forget to stop by the HYMB Kiosk for a cold drink or ice cream after your session! 🍦🥤

Book now via the Better UK app or our website: https://brnw.ch/21x4ufy

We can't wait to welcome you to the lake this summer!

24/07/2026

☀️ Summer Holiday Club - more spaces available!

Due to popular demand, we've opened additional spaces for our Summer Holiday Club, with availability starting next week.

Weekly bookings available throughout the summer holidays:

- 8:30am - 3:15pm
- Herts Young Mariners Base
- Ages 8–16 years

Give your child an unforgettable summer of outdoor adventure. Every day is packed with exciting, instructor-led activities designed to build confidence, develop new skills, and create lasting memories.

Activities include:
🧗 Rock Climbing
🛶 Kayaking
🏄 Paddleboarding
🚣 Open Canoeing & Bellboating
🏹 Archery
🧭 Orienteering
⛵ Raft Building
🕳️ Caving

Fresh air, new friends, exciting adventures, and plenty of fun await.

Spaces are limited and expected to fill quickly. Book today and secure your child's place for an action-packed summer.

Visit: https://brnw.ch/21x4pgh

15/07/2026

Seasonal opening times are here – with extended weekend hours! ☀️

We're excited to announce our Seasonal Opening Times at Herts Young Mariners Base, giving you even more opportunities to enjoy our beautiful natural spring-fed lake throughout the week and now with extended weekend opening until 5pm.

Whether you're training for an event, enjoying a leisurely open water swim, or heading out on a paddleboard with friends and family, there's never been a better time to visit.

After your session, stop by the HYMB Kiosk for a refreshing cold drink or an ice cream, then relax and soak up the lakeside atmosphere.

Seasonal opening times:

Tuesday | 4pm–8pm
Wednesday | 4pm–8pm
Thursday | 4pm–8pm
Friday | 4pm–8pm

🌅 Extended Weekend Opening
Saturday | 7.30am–5pm
Sunday | 7.30am–5pm

Whether you're an experienced open water swimmer, trying paddleboarding for the first time, or simply looking for a unique way to spend your weekend outdoors, HYMB has something for everyone.

Come and discover one of Hertfordshire's hidden gems and enjoy the great outdoors.

Book your session today via the Better UK app or through our website 👉 https://brnw.ch/21x49zs

We look forward to welcoming you to the lake! 👋

07/07/2026

Summer is in full swing, and we're excited to announce our extended seasonal opening times for Open Water Swimming & Paddleboarding at Herts Young Mariners Base.

Whether you're looking to train, unwind after work, or simply enjoy time on the water, our beautiful spring-fed lake is open more often than ever, giving you even more opportunities to get outdoors this summer.

After your session, why not grab an ice cream or a refreshing cold drink from the HYMB Kiosk, relax by the lakeside, and make the most of the longer summer days.

Seasonal Opening Times

Tuesday: 4pm-8pm
Wednesday: 4pm-8pm
Thursday: 4pm-8pm
Friday: 4pm-8pm
Saturday: 7.30am-2pm
Sunday: 7.30am-2pm

Whether you're a regular swimmer, new to open water, or fancy a paddleboard session with family or friends, we'd love to welcome you this season.

Book now via the Better UK app or website 👉 https://brnw.ch/21x3WzG

22/06/2026

☀️ Heatwave Special! – Extra open water swimming and paddle sessions have been added!

With temperatures set to soar this week, we're delighted to announce the addition of Tuesday and Friday sessions to our Open Water Swimming & Paddle programme.

There's no better way to cool off, stay active, and enjoy the sunshine than with a refreshing dip in our beautiful spring-fed lake. Whether you're training for an event, looking for a relaxing swim, or trying open water swimming for the first time, everyone is welcome.

You can now grab an ice cream or a refreshing cold drink from the HYMB Kiosk, relax, unwind, and soak up the summer atmosphere

📅 Session Times

✅ Tuesday | 4pm – 8pm
✅ Wednesday | 4pm – 8pm
✅ Thursday | 4pm – 8pm
✅ Friday | 4pm – 8pm
✅ Saturday | 7:30am – 2pm
✅ Sunday | 7:30am – 2pm

Join the growing open water community, cool down in the lake, and make the most of the sunshine while it lasts! 🌞

To book your session, please use the Better UK app or visit our website: https://brnw.ch/21x3xwP

15/06/2026

We are currently recruiting Lifeguards and Paddle Instructors for the season.

Herts Young Mariners Base is seeking motivated and enthusiastic individuals who are eager to build on their existing skills or develop new ones, joining a dynamic and supportive outdoor adventure team.

Successful candidates will receive fully funded training, including the Ready to Ride Award, PSRC, PSI and Swim Safety Rescue qualifications, providing an excellent opportunity for professional development within a unique and rewarding environment.

For more information about the role and to apply, please visit our website https://brnw.ch/21x3mhv

Address

231 Windmill Lane
Cheshunt
EN89AJ

Opening Hours

Monday	9am - 9pm
Tuesday	9am - 5pm
Wednesday	9am - 7pm
Thursday	9am - 9pm
Friday	9am - 5pm
Saturday	9am - 2pm
Sunday	9am - 12pm

Telephone

+441992628403

Website

http://www.hymb.com/

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