It all depends on what you are looking for.
As previously mentioned Olive Branch is nice, full hookups available with a pool on site. This is one of our favorite places to stay. Roads are all gravel is the only downside for us with little ones that like to ride bikes.
Winton Woods has a nice campground if you're more into rving. Site's are pretty close together but they have some full hookups and some just water and electric. Nice playgrounds, right next to the park with a water park, canoe rental etc. Best shower houses, though if you have the full hookups not as important. We stay here fairly frequently. You have to have a reservation pretty far in advance for here typically unless there is a cancellation.
East Fork SP gives you a little more room and is nice enough. They only have a handful of sites that are full hookups so you will most likely be power only here. This is getting closer to camping than just RVing. We enjoy it here all roads are paved, and shower houses are just nice enough to shower in.
There is a couple decent private parks in the Wilmington area. We've stayed at Beechwood Acres there. You are packed in super tight here. Nice place with a pool. Not our favorite due to closeness of spots, but if you're looking for an rv park with a pool you could do worse.
We're east of Cincinnati so tend to stay in that direction.