There could be various variations to beach parties. Gather up the entire family - kids, nieces, nephews, aunts, uncles, cousins and whoever else you want to be there. Make it a day of fun and include a whole load of activities - play varied games, have a barbecue, swim a lot. Ensure that you get a good tan as a proof of the amount of fun you had. Alternately, you could even host a luau party, it is just as much fun (or more) because of the added factor of dressing up.