Back home this gets very, very complicated. It's not technically illegal to be naked in public, however, if you do it you're likely to be cited for indecent exposure.
It is however, technically legal to be naked in the parks, a fact which wasn't discovered until sometime in 2008 or thereabouts. But, we didn't learn about it until some hippies started riding their bikes naked through the parks.
Here in Zealand we've a pissing law that dates back to the 18th century that states that if we must go in public, if at all possible it is acceptable to go on the rear left wheel of any parked and nearby wagon.
So basically you can have a piss on the rear left tire of someone's Camero if you have to go bad enough. XD
The law here is basically even older than that. It states that "If a person should not survive the urination on or at a specific object, be it because of a lethal application from another person(s) or of other means (electric shock, avalanche, bear attack), then he/she was probably not OK to go there".
Reminds me of Ren and Stimpy. Don't Piss on the Electric Fence.