London’s best fully enclosed, free playground built around a giant wooden pirate ship with sand, water features, and teepee structures. Entry is free but timed-ticket queues form quickly on summer weekends — arrive at 10 AM when gates open. Single gated entry makes it stress-free for parents with toddlers. A small kiosk sells drinks and snacks; toilets with baby-changing are on site.

Address: Kensington Gardens, London W2 4RU

Google Maps: Click here for directions

Cost: Free