Take up a new hobby? Maybe drawing, photography, or ??? Take a bike maintenance class if you already don't know how to rebuild a bike?

I take it you are female? One of the challenges for many females is upper body strength, so maybe spend some time doing upper body work at a local gym?

A friend of mine used the knee scooter. She said it was very liberating. I just wish I could use it now instead of crutches. Oh well, we all have our challengers.