We ' ve been to Restoule', I think its a little gem of a park. We were there the first week of August a few years ago and it wasn't to crowded. We camped in the walk in area to avoid the other folks and stayed at #158 which backed right onto the lake.
You can access the french river right from the park and there is a loop you can do although in the summer it may suffer from low water levels at the top end of the loop( not sure what its like now).
The park itself has a nice trail leading up to the old Fire Tower overlooking Patterson(Stormy lake). Great view of the area. Great landscape.
Its far enough from any highways that road noise is not a problem. There are boats on the lakes(at least 2 boat launches) but nothing heavy.
There's a beach and play area for the kids. The Park pamphlet says there's a museum in Nippising and Commanda and Restoule are all little villages in the area. Of course you can always check out the Dione Quints birthplace near Callander(Corbeil?) and drive into NorthBay for a ride on the Chief Commanda tour boat.
Its been a few years since I've been there, so it may have changed a bit.