I think Moe means a campground campsite, like Mew Lake. In this case, I would think not, thus the need to buy a permit for a campsite. If however you wanted to hike a trail, and have a fire for warmth and cook some dogs over it, there should be no problem with that scenario, as long as you had the aforementioned day-pass. Contact The Park @ 705-633-5572(West Gate) or 613-637-2780(East Gate)
Mark Rubino
Mark's Algonquin Park Sampler - Blog
Mark's Algonquin Park Sampler
http://www.ABRweb.ca .. Algonquin Backcountry Recreationalists - Caring for Algonquin's Backcountry