any good restaurants near Seguin / Parry Sound?
You can eat decently at many of the golf clubs in the Lake Joe/Rosseau area. Prices are very high, and menus are generally unadventurous (catering to the rich cottaging families) but quality is generally good, if you're not concerned with price. The Lake Joseph Club (nice setting -- right on the docks, you can boat up) and the three Deltas are a few options, as well as Windermere House, which recently became an O&B outpost, if I recall.
Taboo, in Gravenhurst, is supposed to be good but that's getting distancey. There's some okay casual eats in Port Carling if you're down that way.
Parry Sound itself is a wasteland. Believe me, I tried.
Enjoy -- it's gorgeous up there. I was lucky enough to work the summer in the area last year and I'm missing that lake right now like you wouldn't believe. ;)