Cahoon Hollow is a beach in Wellfleet, on good old unfancy lower (ie, upper, or outer) Cape Cod. It's their only ocean beach with a bar/restaurant - The Beachcomber - in an old life-saving station. They have bands. I believe Sippican played there in his dissipated youth.
The area is undeveloped thanks to JFK's Cape Cod National Seashore. Sometimes government does good things - but usually not. If you like warm water, the Cape Cod beaches are not for you. And unlike California beaches, at Cape Cod beaches people sit under beach umbrellas, sometimes have to wear wind-breakers in August, and tend to bury their heads in books while the cheerful sand fleas nip at their ankles.
These beaches attract some surfers, but the main water activity is body surfing: exhilarating fun, endlessly challenging, and the turbulence will pull down a gal's bikini top in an instant. Modest gals who like to body surf do not wear bikinis.
Lots of seals to swim with out there in August. The occasional Great White Shark, too. No fraidy cats allowed.