The first two times we went to Happy Bay, I made it a point to buy a beer at the bar at Friar's Bay and ask if it was OK to leave our car for a few hours. Both times, the bartender looked at me as if he didn't understand why I would ask. So the last time, we just parked and walked. The car was fine, but that was also on a busy day with a more crowded parking lot. I'm assuming it's hard to tell who is a customer and who isn't.