Skyline Trail
The Skyline Trail at Interstate State Park (WI) connects the Ice Age Center (which is near the park entrance) and the Pine Group Camp. It follows the outer rim of the St. Croix Valley. It does have some steep hills/natural steps to climb but we did not find it overly difficult to do the trail. However, we did not do the entire trail since some of the lower parts were muddy and it was getting close to lunch time!
One neat feature is the Skyline shelter that was a nice place to stop, get out of the sun, and take a quick break. The shelter also features a fire place that I am sure is handy on cold days!