Herts Young Mariners Base Outdoor Activity Centre Hertfordshire

The Herts Young Mariners Base offers schools a comprehensive outdoor-education experience in the Lee Valley, combining land- and water-based activities that support teamwork, confidence and practical skills.

On the water students can try kayaking, canoeing, bell-boating, stand-up paddle-boarding, sailing or raft-building — all led by trained instructors and adaptable to different ages and abilities. On land there is climbing, caving, archery, bush-craft, problem-solving challenges and orienteering.

Herts Young Mariners Base Outdoor Activity Centre Hertfordshire /  climbing South East / Duke of Edinburgh South East / water sports Hertfordshire 

Herts Young Mariners Base is an excellent group choice for school trips or educational visits thanks to its convenient location near Cheshunt train station, spacious facilities, and a wide range of outdoor activities tailored for different age groups and abilities.

With access to both land and water-based activities like kayaking, climbing, bushcraft, and orienteering, the centre supports curriculum-linked learning, team-building, and personal development.

Herts Young Mariners Base holds accreditation under the Adventure Activities Licensing Authority (AALA).

Herts Young Mariners Base (HYMB) offers a variety of outdoor learning experiences that align with Key Stage and curriculum topic objectives for both primary and secondary school students, if a school wants something tailored this can be accommodated.

Curriculum Topic

We design its activities to support learning across several subjects and Key Stages:

Key Stage 2–4: Activities are tailored to build confidence, teamwork, and physical education skills, which are core components of the national curriculum.

Cross-curricular links: We program to integrate elements of geography (e.g., water-based navigation), science (e.g., environmental awareness), and PSHE (e.g., resilience and cooperation).

Ages range from 8 years old and above and group sizes are 1-10 ratio with an instructor; we can accommodate over 160 children per day.

We provide all equipment and resources.

No restrictions are in place.

We can provide risk assessments and planning resources for teachers.

Email: hymb@gll.org

1-10 Ratio is £250.00 per activity which is 90 minutes long.

The current discount in place is £175.00 if schools’ book prior to 2026.

Yes supervising adults go free.

Phone: 01992 628403

Email: hymb@gll.org

For trips a change of clothing may be required due to getting wet or dirty, depending on the activities. The website link below explains per activity what will be required.

https://hymb.com/group-activities/kit-list-school-group-activities/

Herts Young Mariners Base staff are trained to deal with first aid incidents.

Changing rooms and showers: Suitable for groups and individuals.

Meeting and training rooms: Available for briefings, lessons, or indoor activities.

Equipment hire and storage: Including wetsuits, helmets, and safety gear.

On-site parking: Free and suitable for cars and minibuses.

Outdoor benches: space to eat a packed lunch.

Café: to purchase hot and cold drinks and snacks.

There is easy ground floor access to the centre. There are hoists in the 2 disability rooms and a waterside hoist to assist participants on to the water if required.

Monday 9 am–5 pm

Tuesday 9 am–5 pm

Wednesday 9 am–8 pm

Thursday 9 am–8 pm

Friday 9 am–5 pm

Saturday 7:30 am–2:30 pm

Sunday 7:30 am–2:30 pm

Herts Young Mariners Base in Cheshunt is well-served by a range of transport options, making it easily accessible for visitors. The nearby Cheshunt Railway Station offers direct train services to London Liverpool Street and other regional destinations, ideal for school groups and commuters. Local bus routes connect the base to surrounding towns such as Waltham Cross, Broxbourne, and Enfield. For road access, the base is close to the A10 and M25, providing convenient links for car and coach travel. Additionally, cycling paths and pedestrian-friendly routes through the Lee Valley Park offer scenic alternatives for active travellers.