In Munich, they passed a law declaring six areas of the city as "Urban Nude Zones". These are public parks you can walk around completely naked. There's one called the English Garden that's just a short walk from the downtown area. They are normal public parks in every way (swing sets, playgrounds, grassy areas, food carts), except people are naked there.
Here's a comedy tip for you next time you visit an urban nude zone. The food cart guy has heard every bratwurst joke, and will cringe when you tell one. Be ready with your "Don't be a sauerkraut" retort. It may not amuse him (he's German after all), but you'll have a fun cocktail party story for your fully clothed friends later that night.
