This Geocache is a Bison Tube Hidden in a sign. "The Louisville Swamp contains the closest real rock to the Twin Cities. While the Big Boulder (granite) is the main attraction (I've done at least two dozen problems on it), there are two other bouldering areas to explore. One is located on the Mysterious Island in the middle of the swamp itself. It has problems on solid, nearly quartzite-like sandstone. It is only accessible in winter as you have to cross the ice to get there. The other is my personal favorite, The North Shore Overhangs. I am not going to tell you where it is, but if you find it you will be looking at some of the steepest moderate bouldering (V1-V4) in Minnesota. I have been working the lines there for years and some are really, really good. I'm talking sit starts on 8-10 foot sandstone roofs with funky topouts. There are more difficult lines to be done..."
-Paul Getzke