I agree with the route suggest by wannavolunteerFT. This drive is worth taking along the coast. You won't have any problems with the roads. We have taken these routes before.
Things to do I would suggest back tracking west on HWY 98 About 24 miles in your toad. Head over to St George Island and Apalachicola. As you head out to St George Island just before crossing the bridge on the left the Apalachicola Environmental Education ad Training Center. Very interesting place.
http://www.dep.state.fl.us/apalachicola/education/center.htm
Enjoy the trip and have fun.