There are quite a few PMAs.  The rook website is a good resource.  

Their location in the BW can be misleading, as they are mostly bushwacking, not your typical BW or Q experience.

There are no designated campsites, but you may find some old leftover sites which are hidden, and steel grates have been found, as well as old wooden thunderboxes.  You may also find makeshift sites that have been created by PMA campers, though in our case we've made them far from the waters edge.  There are also some old portage routes that you might stumble across, but they are very overgrown and not really there anymore, but you might find the evidence.  A few old relics and even some newer artifacts have been found.