“in the U.S. there are no such public beaches”
There are, however, remote isolated beaches where you won’t see anyone else except for perhaps a park ranger driving by on a beach vehicle.
There are additional issues that are even more important than the pritzus. Self-induced skin cancer, for one. Deadly riptides, for another — I almost drowned once about 20 years ago in a riptide off a deserted California beach — I was about 1/2 mile out to sea before I was able to swim about a mile parallel to shore and get out of the riptide. And because it was one of those remote isolated beaches there were no lifeguards. Fortunately I am a strong (although not fast) swimmer; all Jews need to learn to swim!