Hotel breakers, and sandcastle are located just outside the parks gate. There is also the campground and lighthouse point on the island as well.
Be forewarned though, the prices at these resorts are pretty steep for what you get. If you have a platinum pass, you still get the early entry, and don't need to stay on property to get the perk. To be honest, the hour early entry may get you on 2 rides before the gates open to the public. You also have other platinum pass holders filtering in during that hour, so the lines get progressively longer.
We were going to stay on property again, and decided against it. We ended up getting a room just down the street, and platinum passes(for 3), and still spent less than getting a room on the island with only tickets. Rooms at the cedarpoint resorts average between $130-$300 per night, unless you go early in the season, or sometimes durring the week.
The rooms at the cedarpoint resorts are average at best. Some of the rooms are very outdated.
341 steel coasters
114 wood coasters