It also depends which resort you're staying at. I rented from National once, picked it up at the airport and stopped for groceries. Returned it at the Dolphin - very convenient as the bellman just took it from me and gave me a receipt. We were staying at the Swan. It was only about $35 total. Just kept it for one day (actually a couple of hours). That was a good option for that trip. I've paid $55 for a taxi back to the airport from that resort - just got one out front. That was simple, so worth the extra $.