Decorate: Cover tables with beach towels. Scatter beach balls, lawn chairs, and inflatable palm trees around the room.
Eat: Serve smoothies with mini-umbrellas, burgers, fries, and other beachy fare. Decorate cupcakes with blue icing (water), yellow-cake crumbs (sand), and Swedish fish.
Make: Refrigerator magnets from seashells, craft clay, mini-magnets, and glue. Or try sandscapes with colored sand in clear plastic jars.