i already posted to but get a dog and take it for runs etc basically just get a dog and play with it etc lol it seriously works i take my dog on runs cos he is big and needs lots of exercise ^^
try track cycling. Quite hard to get into it and get the hang of it, but im sure most velodromes offer a hire bike service. Give it ago!
lacross can be fun and so can golf they both give you good work outs but i prefer golf because of my dad. my dad is like crazy about it and so i usually play it because of him and thats why i like it so much