Thanks Be Kind Belize - very useful info.
Younger dogs require more exercise than being cooped up in the yard day in and day out...This also helps them to learn how to socialize with other dogs and people. There is no reason why dogs cant play on the beach, while their owners supervise them and make sure they dont cause a nuisance. Most of the owners will be on top of it, if the dog barks or chases a bike. Live and let live.