The beach seems to bring out the artist in more than the likes of Andy Goldsworthy! I think we start when we are very young. Who hasn't built a sandcastle during a summer holiday? The next tide washes them away but not before the hours of digging, slopping around with wet sand and seawater for the moat and trawling the beach for seaweed and shells for decoration must generate some of childhood's happiest times.
Heavy sea swells and high tides bring in driftwood which is great for a beach bonfire and barbecue during the long summer evenings, weather permitting of course, or it can stir the Robinson Crusoe amongst some.