Andy's car rentals are very easy (www.andyrentals.com). He can arrange everything. Even has a US #, 215/550-7010. Also, try GB Ferry service. They're across from the airport and use high speed boats that only hold 6-8. They're more expensive than the regular ferry in Marigot, but smoother and quicker. Serenity Cottages on Shoal Bay East are sublime if you want to stay over for a day or so.