Hi all, we've got a day to kill before our flight from Heathrow next month. 2 adults plus 5yo and 7 yo. Our hotel has a pool so that will take up most of the morning but I'd like some suggestions for the afternoon please! Outdoor ideally, (not Legoland) no car but happy to get a taxi as long as it's not too far. Any adventure playground type places around that area? Thanks