We just returned from a week on Marco Island and had a great time. But I wanted to post a warning about car rental from RSW. We rented a minivan through Avis and did not purchase the tank of gas - choosing to return the vehichle with a full tank. DO NOT WAIT TO FILL UP THE TANK AT THE AIRPORT BEFORE RETURNING THE CAR. There was not one gas station between the I-75 freeway exit and the airport. I asked the rental car agent where the nearest gas station was and she said it was about a 10 minute drive. So, not having an extra 1/2 hour to go looking for a gas station, we had to pay the outrageous $6.00/gallon. We had about 1/2 a tank of gas upon return so it cost us $65 for 1/2 a tank of gas. :o[
When we picked up the rental car, the Avis agent failed to let us know there were no gas stations anywhere in the vicinity of the airport. So be warned if renting a car from RSW - if you need to return the car with a full tank, fill it up before arriving at the airport!!