Located on the southern edge of Lake Mills, the winding 52-mile-long Glacial Drumlin Bike Trail follows the path of the old Chicago & Northwestern Railway that operated in the 1880s. It runs east and west from Cottage Grove to Waukesha along glacier-formed elongate hills formed under the great continental ice sheet. It crosses Koshkonong Creek five times, as well as the Crawfish and Rock rivers and the old railroad bridge across Rock Lake. Its surface is mostly crushed stones, but 13 miles are paved. The trail is open to bicyclists, in-line skaters, hikers and joggers in summer and to snowmobilers and skiers in winter. A state trail pass is required for bicyclists and in-line skaters. These may be purchased at the Trail Headquarters at Lake Mills, private vendors along the trail and at self-registration stations on the trail. Camping is available at the Sandhill Station state campground just down the road from the headquarters, which is the old Lake Mills train depot. Bike rentals are available in Fort Atkinson and other area bike shops. It's an enjoyable way to see some of Wisconsin's most beautiful countryside and farmlands. Take some time out for bird-watching at Zoloski Marsh, a new wetland and grassland being restored, and don't miss the herd of buffalo just north of the trail between London and Lake Mills.