Would it not be a great idea to find out which is the mankiest, clartiest, (Scottish moment ), section of beach to the front of a restaurant, take a large party , ( 12 or more ), of prospective customers there, make a show of perusing the menu board, then, just before taking the proffered seats, point out the state of the beach to each other, get up, and walk off !! ??

I bet that particular stretch of beach would be nicer next day !!
