The very best suggestion I ever read when my kids were little was to carry baby powder to the beach. No matter how much you try to rub the sand off, you still carry too much home! A little shake of baby powder is the miracle cure. Rub it between your toes and wherever else it’s stuck (really, wherever!) and the sand comes right off plus you smell great! I still carry it in my beach bag even when the kids aren’t with me.