Level of Nudity: Girls
What You'll See: Though the beach is generally more clothed than not, there'll be a least a handful of people wearing Miley Cyrus wrecking ball-riding attire. Just bring a jacket or something, because this is San Francisco, after all.
The Nude Part: All of it, apparently. Just don't strip down until you've gone down the crazy winding path at the end of Geary and make sure you don't go right when the path widens out, because that'll lead you to a clothing-very-necessary golf course.
Level of Nudity: Game of Thrones
What You'll See: As the largest urban nude beach, this place attracts the largest crowds and almost a Burning Man-type atmosphere with artwork, drums, and frisbee. Disclaimer: if you act like a weirdo and just stare at people, you will be told to leave.
The Nude Part: When you get to the beach, go to the right, past the "Hazardous surf, undertow, swim at your own risk" sign.