There are so many nude beaches in the world. Some are famous like Haulover in Miami, and Blacks Beach and San O' in Southern CA. Makena and Little Makena in Hawai'i are also on the list of famous. But also there are several in Jamaica and other parts of the Carribbean, Mexico, and all over Europe. Even on the cold North Sea beaches of Germany. And some are are resorts such as in Florida but also all over Europe. Switzerland, Austria, Germany, Denmark, France, Italy, Spain, Portugal, and Greece all have nude beaches and nude resorts.
As far as seeing "hung guys" on any of them...that is like anything, a matter of "luck" and circumstance and timing. Certain times of the years or days of the week (weekends as an example) more people are present so you might get "lucky". Also, when holidays are more common in Europe (July and August) the resorts and beaches are literally covered with nude people and some of them will be endowed. In my many years of nude recreation ( Nudist - American Association for Nude Recreation
) I have seen quite a few other men who were endowed. Spoken with more than a few of them. Like someone else posted earlier, most of them are there with their family/wife/girlfriend/boyfriend/significant other. Some are single and alone too. And others are part of a larger group of people who are friends. One of the first nudist venues I ever visited was in a town in southern Germany that had both a clothing optional "spa" which was world renowed for a luxorious spa experiece, and also had just outside "town" a nude beach along the mountain clear (and snow fed cold) river. People came, during the warmer summer months, especially on weekends, by the thousands from many miles away to relax on the nude beach and the high sandbar that was just off shore. In the winter months, the resort with its several heated indoor and outdoor swimthrough pools and spas and tanning and nude ambience was the big draw. The river was interesting and something I remember in relation to your question because I remember meeting several people there over several years, but a couple of other hung guys were regulars there too. One guy and his girlfriend and friends from Augsburg used to drive down regularly and a couple from the Munchen and other areas near by also became friends or at least friendly acquintances. The spa I once met a guy and his wife and saw them often there and we became friends. I also visited a nude beach in southern Africa many years ago and it had a large crowd as well though I was told it was an unsanctioned beach...which I was given to understand meant it was not allowed but the "authorities" ignored it.