Here in the US, Black's Beach (California), Mazo Beach (Wisconsin), Hippy Hollow (Tx), Gunnison Beach (NJ), and Haulover Beach (Florida) are the best known, but there are many many others. Enjoy!
Hippie Hollow, a beach in Austin Texas. Totally nude. Including water and boats. I went there once, took my Mom!
Rooster Rock state park on the Columbia River east of Portland, Oregon. I should warn you. An 80 year old, 350 pound woman showing it all could cause post traumatic stress disorder.
Blacks Beach in San Diego, CA
I was never on one , but you could be disappointed .