Welcome to the forum! I envy you in being able to check out the Ontario Provincial Parks. We have been to several and some have large sites where you will have no problems and a few have smaller sites which may be a challenge. I guess you will just have to take several trips to check them all out and then you can report back to us. Sounds like a tough job, I wish I could do that myself. We love Algonquin but I do not believe that they have camping within the park but there are places just outside of the park. There are several going up around Lake Superior that are really great parks, it makes a nice trip to just go around Lake Superior. You did not say what part of Ontario you are starting from so that I am sure will make a difference of which parks will be easily accessible for just a weekend trip. I think you will be able to find places whatever you decide to get so I would go for the model that suits you the best and adjust your camping trips accordingly. I am sure you will be able to find spots at most of them. Have fun and let us know how it goes.