Presidente Figueiredo is a popular starting point for eco-tourism in Manaus area. You should go to a local tourism agency and choose what you want to see and take a taxi with a guide. There are plenty of streams,
waterfalls, caves, and as it is all in the Amazon jungle, of course it is easy to find a place where you can just take off your clothes to get relief from the sweat (otherwise you will be doomed to have this unpleasant feeling of wet clothes on you, as it is so humid that without free access to the air, sweat just stays on you).
A video with young guys from Fratpad showing all kinds of moves from shower dances to real break-dance, created a stir among several visitors of this website, but was eventually deleted by Vimeo for copyright infringement.
Another video with naked dancers, an advertisement from London's super club and electronic music label Ministry of Sound, went somewhat unnoticed. But now it's been deleted from Vimeo too, for another reason though:
Athens has a few secluded beaches that are known to have naked bathers, but this one is a true hidden gem: it's close to the city center but almost impossible to come across without knowing the exact location, and yet it is really beautiful.
So, of course, it is a great place for skinny-dipping.
I learnt about this place thanks to Nico, one of the devoted readers of my blog from Athens.