Wilson State Park is located on the south side of Wilson Reservoir. The park is divided into two areas: Hell Creek and Otoe. Primitive and utility camping sites are available, as well as several cabins with electricity and plumbing. There are also RV pads and dump stations in each area. Other activities that can be enjoyed at Wilson State Park are wildlife watching/photography, boating, fishing, horseshoes, biking, hiking, and swimming. Come to one of Kansas' premier recreation hot spots to fish, hike, water-ski, or just enjoy the outdoors. We also have one of the best mountain bike trails in the state.
There's several mountain bike trails on the south side of the lake. Switchgrass, Hells Creek and Golden Belt. The trails have lots of switchbacks through the tall grass and next to the water. Not too technical, and few steep climbs. Beautiful oasis in the middle of Kansas, it's a perfect place to stop, stretch your legs and rest after driving along i70. You could spend a weekend here exploring the trails.
Rock City is rated as one of the top hikes in the state. I suppose its relative to what is available in the state. Most will not find it remarkable. However, it is a nice hike through a pristine prairie, nice lake views, and yes a couple nice rock formations. It was a pleasant hike.