We just spent a week on Anegada. Cow Wreck meets the criteria - beautiful beach, sandy entry and the beach bar is so close to the water. Car rental with Dean Wheatley was $256 for the week. But you can easily arrange taxi service. We’ve used L&M Taxi before. The road from the anchorage to Cow Wreck is almost all paved now. If you have 4 hrs to spare I’d highly recommend taking a boat trip with Sherwin Walcott’s of Team Work charters. If your girls like to snorkel and boat they’ll love it. Catch fresh conch from the ocean, watch Sherwin catch lobsters by hand and snorkel a few reefs you can’t get to by dinghy. And see the flamingos and the conch shell piles!