Well if you just want to become famous then forget it. To become succesful you have to have your heart in something. Now to the question you could try bodybuilding. Lifting weights ect. You can build an awsome physique and go in to competitions
I don't know about a sport for Olympics, but track and field is a good start. Basketball, soccer, and possibly baseball.
it would take awhile to actually go to the olympics in any sport you do unless you are just naturally good at it. Try tennis. Its easy to catch on to and in a couple years you could be good enough to go to the Olympics!
If you wanna go pro try something that few people do like rowing, parasailing, wakeboarding, kayaking, fencing, weight training, shotput, and if you are tall and athletic i know pole vault and high jump are pretty easy to do if you have the body for it
football
horse riding
volleyball
basketball
wheelchair basketball
swimming
swimming & volleyball its 2 options:)