Renting an aircraft is easier than buying a beer in Florida! Heres a few phone numbers on the Orlando Kissimmee Municipal Airport in Osceola County:
FBO's :
Kissimmee Aviation 407/847-9095
Marathon 407/846-6128
Reilly Aviation 407/847-7477
If you can't rent a PA28 from any of these guys, I'll eat my proverbial!
Kissimme is a good airfield with a very friendly tower.
Good luck and happy flying.