I keep a thing of baby powder in my beach bag. "baby powder gets sand off your skin easily, who knew?" - my aunt did! This was a lifesaver at the beach this summer! Totally keeping powder in the beach bag from that day forward!
Use a mesh laundry pop-up bag for beach toys, at the beach and home, and keep the sand where it belongs. Also, use baby powder or corn starch to get sand off of skin. Just sprinkle where the sand is and it falls right off!