We recently stayed at Holiday Shores campground/resort for five days and didn't want to leave. We have a 28' travel trailer and the sites are spacious. We camped at the sites near the water and the view was great. I have two young children (6 & 3) and they loved all the activities that the resort had to offer. The pool is nice and warm and was not crowded. The general store is centrally located and well stocked for all the things you might forget. The homemade donuts are delicious as they make them right in front of you. The bathroom and showers were nice and clean as well.
Our favorite part is the waterpark pass (included w/ camp site fee) you get for Chula Vista which is indoor/outdoor and only about 1 mile away. I knew they offered this ahead of time and figured it would be a rinky dink waterpark and I was wrong. The waterpark is organized and ran well. We would go to the park for a few hours and then head back to the camper for lunch and then return in the afternoon. The waterpark is super busy on the weekend so try and go during the week if possible. Again, there was a lot of things for my young kids to do. We also visited Mt. Olympus which was nice, but for the money Chula Vista is just as good. The Wisconsin Dells is a lot of family fun, but we found ourselves wanting to hang around the resort and take advantage of the many activities. If you are planning on camping in the Dells I strongly recommend Holiday Shores campground.