A couple of boulders just off of a big trail/old logging road. Some of the rock seemed to be standard Devil's Lake quartzite, but other parts are kind of half way between quartzite and sandstone.
These directions aren't the best, but I've included the GPS coordinates. Park as close to the railroad tracks as possible at the south shore lot(not the boat landing), and start walking east down the tracks. Walk until you see the 170 marker on the south side of the tracks and head uphill. After a while you should come across a trail marked with orange tape that runs south-west, I followed this until I didn't see anymore tape. Continue walking south-west and hopefully you should stumble upon an old logging road. Walk a little way on this until you see the boulders maybe 50 yards off the trail on your right. GPS: N 43 23.524' W 89 42.731'