Wellfleet is the clearest demonstration on the Cape that the coast you pick matters more than the town you pick.
The ocean beaches. Marconi, White Crest, Cahoon Hollow and Newcomb Hollow sit at the foot of tall sand cliffs on the Atlantic. Cold water, real surf, strong currents, and the purple shark advisory flag flying as a standing notice. White Crest is the surfing beach. Cahoon Hollow has the Beachcomber, a bar and music venue in an 1897 life-saving station at the top of the cliff, which is the only place on the Outer Cape where the beach and the night out are the same address. Marconi is a National Seashore beach and takes the federal pass; the others are town beaches on town stickers.
The harbour and bay side. Mayo Beach and the harbour front are shallow, warm, and calm enough for very small children. At low water the flats go out a long way and the shellfishing grantholders come out with them.
The kettle ponds. Gull, Long and Great Ponds are freshwater, spring-fed, warmer than the ocean by a wide margin and connected to each other by short carries that people paddle in sequence. For families this is often the better swim than either coast, and it is the one nobody thinks of.
Stairs are the hidden cost of the ocean beaches. Every one of them involves a long descent and a longer climb back, carrying everything.