Myself, I don’t have any tan lines
La Playita in Manual Antonio (southernmost beach in the park) is pretty well accepted as a nude beach in Costa Rica. Just about wherever you go nude gay guys are going to be there, they seem to have a more body acceptance culture; never have bothered me. By nature if you want to hang out nude in this world you don’t wanna be too shy or self-conscious;
Costa Rica has miles upon miles of beaches. If you can’t find a place to kick off your shorts you are not walking far enough IMHO. As long as you are not ‘offending’ anyone it doesn’t matter what you wear or not wear in the remote beaches. Watch out though the sun is powerful.