6 places

Afternoon Tea Animal Enclosure Animal Park Aquarium Art Gallery Art Studio Art Workshop Attractions Boat Trip Botanic Garden Bridge Castle Entertainment Events Farm Fountain Garden Gardens Hill Historic Castle Historic House Historic House Gardens Historic Ship Ice Cream Shop Immersive Art Immersive Experience Indoor Theme Park Landmark Library Market Museum Museum Ship Nature Nature Events Nature Park Nature Reserve Nature Trail Outdoor Adventure Palace Park Park Gardens Planetarium Playground Railway Restaurant Riverside Seaside Seaside Attractions Shop Theatre Theme Park Town Transport Venue Viewpoint Views Walks Wildlife Trail Woodland Zoo

Roof garden - a few options available
Free / cheapOutdoor
Horizon 22
Free / cheap☔Outdoor
Southbank Centre, family events
Free / cheap☔Outdoor
Hever Castle
Moderate☔Outdoor
Leeds Castle
Expensive☔Outdoor
Brighton
Free / cheapOutdoor