The House That Rocks Built.
St. Cloud, Minnesota is home to a unique park that was converted from a 1940's rock quarry into a nature preserve. Now the rock quarries have been filled with water, and hiking trails wind their way through the backwoods surrounding the area. I would recommend checking the weather before you go, as it is generally frowned upon to go swimming when its 40 degrees (AKA Minnesota Summertime) outside..