Beware the poison ivy: Stands of the three-leafed plant are plentiful here and cause uncomfortable rashes.

Water can get deep quickly, even at Little Sandy Beach, which is a family favorite. Keep a close eye on swimmers, as there are no lifesaving services here.

Dogs are allowed, but must be leashed at all times.

There are no toilets or other facilities on-site—the closest services are in Woods Hole or the gas stations lining Route 28.