The ever favourite beach party is always hit with the young and the young at heart. Bring a guitar – a bat & ball or a volley ball – or just veg for the afternoon and into the evening.
If the beach is reasonably popular with a few families around then try a game of hide & seek – not just the kids but adults as well. It is so funny when you walk around and realise that the person sitting with a a family or sun-baking next to a another person is one of yours not theirs.
Seating is of course optional – but after dark an open fire with marshmallows is almost mandatory.