We just got back from Ionia State Campground, and we had the most lovely time! First of all, I did some research ahead of time to find a more private camping spot, and ours did not disappoint. After looking around the campground, there were numerous spots that were very secluded and private. There were beautiful walking trails all around, and the lake was very pretty.
I had read other reviews saying that the bathrooms were terrible. I did not find them to be all that bad. They were certainly dated, but I found the bathrooms and showers to be kept as clean as they could be. I have also read that the bathrooms will be completely replaced at the end of this year.
The one downside I did find was the beach. I thought that the infrastructure at the beach needed work, particularly the rinse off station and the benches. We only went over to the beach for ice cream, so this didn't bother me personally.
We loved it and plan to come back!