First....
what access point are you thinking of?
Second.....
if you don't have a Canoe Routes Map, you can do a quick browse at the "Trip Logs" section, found on the homepage here on AA
http://www.algonquinadventures.com/ just in case you bypassed it in getting here to the message board part.
There's a visual there that will show you roughly where the access points are, in addition to the trip logs.
Third.....
y'all been to Algonquin before or not?
And D....
4 tents on one site? Maybe, maybe not...depends on the lake(s). I've seen sites that you would need a shoehorn to get one tent to fit, never mind 4.
and finally....
Welcome to AA. The best, the only "All Algonquin" site you will ever need.
Barbara