Happycat - there's a place called (I think) Paradise Wildlife park in Broxbourne, Herts. For some reason they get a lot of lion and tiger cubs, that have been abandoned by their mothers, to hand rear. They used to - and may still - run a scheme where you could pay to play with a cub. The money is used for a vaccination scheme for dogs belonging to the tribespeople of the Serengetti. The dogs were all getting distemper and passing it on to the lions - who were consequently dying. So good fun for a good cause. Anyway, I filmed the cubs - several years ago mind - and they were gorgeous.
Anyway, here's my list ... and you might spot a theme here.
Ride an elephant on Safari - ideally would like to go to Botswana where some mad man has trained African elephants for this purpose, but India etc would do too. (Just got to win the lottery).
Take a racehorse out on the gallops.
Swim with wild dolphins (managed to throw myself off a boat last summer after spotting a turtle but that's as far as I've got).
Husky sled racing.
Make friends with a gorilla.
Go trail riding in the States - had an absolute Cowboy and Indian fixation as a kid (Thought all cowboys should be shot and the Indians should get their land back).
Go whale spotting.