LOTS of places to anchor! No big cities anywhere nearby, so most anchorages you'll have to yourself. I haven't been up there in 20 years, so hate to provide much in the way of specifics for you. I can tell you 2 things. I was in complete awe the first time I sailed the area, and returned many times afterward. Second, many consider this area to be a world class cruising area. That was the reason I sought it out to start with. Read about it and couldn't resist trailering our 26' boat to Detour Island on the far West end to check it out.
Last, because this place is so, well, neat, there's a ton of info written about it. Check out a google search on "North Channel Georgian Bay" and related.
Note that you'll want to have charts with you. Some of the passages will have you passing mountain size rocks that are barely submerged. Not difficult to navigate, just be aware!
