We've had good luck with Zip Rental over 4 trips. They are a smaller local company with slightly older "island" cars. Never an issue with reliability and their service is second to none IMO. Just know you will not be getting a brand new car. A/C has always worked well and again no issues at all. We had a Rav4 from them for our 10 day trip to STJ this past July and enjoyed the vehicle. It would be a good fit for 4 adults with luggage as well. No website but their phone number is: 340-715-1501. They will drop car to you at airport and meet you there for pickup at the end of your trip. Really convenient. If you decide to give them a call tell them Chip from Texas referred you. I get nothing from it but want them to know I appreciate their service.

Have a great trip.
Chip