From I-68 take exit 43B, Industrial Blvd, traveling south along the Potomac River valley. Pull off the highway at access points to the C&O Canal for a view of the fall foliage along the Potomac River. Plan to hike through the Paw Paw Tunnel (3,118 ), the only tunnel on the 184.5 mile Canal (but take a flashlight). You may even want to bring your sleeping bag to enjoy an overnight stay at one of the designated Canal campsites. Then travel up through Green Ridge State Forest to Little Orleans. You may wish to rent a canoe from Allegany Expeditions (301-722-5170) for a leisurely trip on the Potomac.