I purchased my kayak from Frontenac Outfitters and they had a wealth of information (and suggested routes...there are plenty of portages for most routes, but they had some interesting ideas) I don't have their website address handy, but I think there was some information there, and if not, they may be receptive to an email enquiry. Their shop is right on the edge of the park, and they do trips there often.
Keenan
www.gokayaking.ca