Seneca Creek State Park Trail features 7 miles of hiking trails near Germantown, MD.
Take I-270 to Shady Grove road (near the Rockville exits off I-270.) Head away from the home depot and gas stations. Take Shady Grove until you hit route 28 or Darnestown road and turn right. Make a right onto Great Seneca Highway and follow it for a while. Make a right onto Clopper road. Take either a right or left into the park after a little while on Clopper ( I am not sue which way you pull in.) <br /><br />I am pretty sure of the directions not 100%.
http://www.tripleblaze.com/trail.php?c=3&i=812