I think it's probably better value if you make a 'holiday' out of it too. Instead of just renting an aircraft and boring holes in the same bit of blue sky why not rent an aircraft for two weeks, take a friend or the good lady/man and go on a tour, take in as many different airports and experiences at the same time. So much more to do in the USA than just flying from Kissimmee to Lake Okechobee and back every day.