I must say I hate heights , but I’ve tried to conquer my fears and visited the new tree top walk at Kew Gardens. It only openened last weekend so one of the first. It’s some 60 feet, (18m) above the ground so you don’t really wan’t to fall. It wobbles a tiny bit and the gang way has holes so you can sort of see down. Still it seems reasonably secure 😉 A few pics. from my Panasonic TZ1. See http://www.telegraph.co.uk/gardening/main.jhtml?xml=/gardening/2008/05/23/garden-kew-walkway123.xml