Parks book up quickly online 5 months in advance in Ontario. They do hold a couple of spots as unreservable and they are first come first serve. Pretty risky and stressful. If you don't get in the next park could be hours away. Once you get north of Sudbury and the Sault it gets easier to show up without reservations. Most provincial parks have hydro sites but not many have water and sewer. There are a lot of private parks too but they are hit and miss. We find a lot of them cater to seasonal campers and tend to be drinking holes for the locals.
You can leave your guns at home. You won't need them here. Even the bears are friendly ;)
