Walking trails, and biking paths are great there!! I'm not sure how expensive the golf cart rental is, but reserve long ahead of time for them, they are a limited amount and go fast.
WL does not have golf carts. I believe Ft. Wilderness does though. You can rent bikes at WL and ride it on the trails to FW.
Depending on how much you are going to utilize renting boats/bikes, you can buy a pass for your entire stay or you can rent as you need it.