I do have a fav beach that is only accessible by boat and a secret path. The sand is white and super-fine, there is a spring fed stream on one end of it and it faces southwest. Powerboats are banned on the water access point which makes it both peaceful and difficult to get to. Behind the sand is an endless forest. It rarely has more than a handful of people, if there are more than 4 there is usually at least one nude bather. Often you have the beach to yourself. The water is crystal clear and if you swim a ways out you can see the bottom of the lake about 30ft below.
And no, I am not telling you how to find it.