With husband and son trials riders in our family I can definitely agree. Last year we visited Hong Kong spam. There is an attraction there called Tarzan's Island. Once on the 'island' there are numerous 're-creations' of Tarzan's habitat. This includes man-made caves, waterfalls, nooks and crannies etc. Whilst my daughter and I marveled and were caught up in our childhood with the actual attraction (like just about every other tourist there), you can guess what the other two were doing.............
( I actually have a photo showing it but can't seem to make it 'small' enough to attach)
Maree