Think about St. Pete Clearwater area, you are close to the Pinellas Trail (very nice trail) and The Sun Coast Trail, and The Legacy Trail in Sarasota is a great ride. Ft Desoto in south St Pete you can combine a nice ride along the coast and a day at the beach and walk around an old Fort at the same time. Still just a 2 hr drive from Disney and a hour and a half from the Withlacoochee Trail and the James Van Fleet Trail