Jump In by AirHop Adventure & Trampoline Park Elstree

Wall-to-wall trampolines in an aircraft hangar just outside Elstree - that's Jump In. It's an indoor adventure park where kids (and adults who don't mind looking silly) bounce around on interconnected trampoline beds, tackle foam pits, and throw themselves at dodgeball courts. You're not tramping through nature here; you're in a converted industrial space bouncing until your legs give out.

Families with children aged five upwards will get the most mileage from it. Younger kids need constant supervision on the bigger rigs, so solo exploration isn't really an option. A couple of hours is enough - after that, even the most energetic children start flagging and the novelty wears thin. It's the sort of place you visit on a wet afternoon when the park holiday plans have gone sideways, not the centrepiece of your break.

Costs aren't listed online, so ring ahead. Opening hours vary seasonally, which is typical for these venues. If you're staying at Aldenham Country Park nearby or one of the other holiday parks dotted around Hertfordshire, this makes a decent rainy-day option. The Mimms Caravan Park is only 2.3 miles away if you need a base. Worth booking a slot in advance rather than turning up hoping - these places fill quickly during school holidays. It's functional, energetic, and genuinely tiring for the kids, which counts for something on a family break.