Lots of 'if's' Leo.
If the people on the beach site are quiet, no problem, but if they are having a party..then well you know. I'll tell ya though all the moose seemed to be down in the longbow narrows area. If the beach site is taken on Rosebary, the southern site is not too bad at all, I would've liked to stay there,(but it was occupied). I figure campsite worthiness is all a matter of opinion. I'd favour the west facing site on Longbow, the one on a point. It has alot of ferns in the back, but it has room to move around. The other site with the blade of a steam shovel(I guess) for a windbreak for the firepit, was nice and cozy, but too small for my tastes. You might prefer a smaller camp, who know..I just know that particular site sees very little sunlight. Good Luck and let us know how your trip turned out.
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