Athlete without a sport

Ok, this is a weird question but l'd appreciate some ideas.

I was a baseball player and a real athletic person for a long time, but, as was the case when I was playing, I was told not to lift or spend a lot of time on conditioning. Naturally, the inevitable happens and several hypertensions and muscle tears later, I am on my couch out of the game.

Finally got the right rehab going a few months ago and am getting back into shape, but without a sport or an athletic goal to work towards i kind of feel like l'm just spinning my wheels.

Anyone have any suggestions on a sport/ competitive activity a returning athlete with a history of knee and shoulder injuries could get involved with?