We have stayed at Mill Creek a couple of times and it is a nice park but busy. They will not let you bring in your own wood, but will exchange a bundle if you have it with you. They have different power areas so if it is hot and need air make sure you get into the 30 amp area. For our size campers they have lots of wooded lots with reasonable space. Check out their map as posted earlier so you don't end up with the big rigs which are really packed tight. They had an area with 20 amp plugs but is really 15 amp service when you get back to the circuit breakers. If you end up in that area which is nice you have to run everything on propane to save your power for the AC. When the hot water heater turns on in the middle of the night is not the time to find this out.
If you have time, the park across the street is a real treat. They have a combination ticket for all 3 and we enjoyed them all. The other 2 are in town.