Welcome to the RTA Forum!

I've moved your thread to the "Share the Gas" section where you are more likely to find another person to join you on your trip.

I think your trip looks fine for the most part. A couple things to think about.

Youth Hostels are far less common in the US than in Europe. They are there, but you'll have to do a bit of looking to make sure they are available in all the places you are planning to visit. Also, you may want to check on parking, as often they are located in urban areas with limited or expensive parking.

If you are planning to visit Canada, you'll need to make sure that your car rental contract allows cross-border travel. It is possible to walk across the border if that ends up being an issue.

The amusement parks near Cleveland you mentioned are probably in Sandusky. Cedar Point is famous for its roller coasters.

Good Luck and if you want more questions let us know.