This is a mellow ride on dirt roads along the Potomac River. Add distance by doing more loops.
Start at the White's Ferry parking lot. Follow River Road as it parallels the canal. At 3.7 miles, continue through the intersection on River Road. At just over 5 miles take a right on Edward's Ferry Road. Cross over the canal and take the tow path back to White's Ferry
How to get there:
From D.C. take I-270 about 10.5 miles to MD-117 heading west. At the second stop light take a left onto Quince Orchard Rd. At Darnestown Road make a right. Stay left after about 6 miles on Fisher Avenue then White's Ferry Road for about 12 miles until you reach the ferry parking lot.
The ferry is about $2 to cross each way - bring some cash.