My husband and I will be arriving in August - St. Croix. Not sure if we should rent a car from the airport? can we drop off the car at the tour place that we will take the next day? Also, not sure if we should take the full or 1/2 day tour around the island as we will only be staying for 3 1/2 days. Also the trip to Buck Island for snorkeling, full day versus 1/2 day, again limited time to spend on the island. We are looking to take some time just to RELAX....thank you for your input.