Hi all, we've got the bike and run courses all set. Take a look!
Bike Option 1 goes up Beach Drive, around through Kensington, Silver Spring/ Takoma Park, and back into the park through Sligo Creek. 25 miles. See the map here, courtesy of Abby: http://www.mapmyrun.com/view_route?r=173127955479922224
Bike Option 2 is to bike 'up and down' Beach drive from the Picnic Site. The site to Viers Mill Park is about 7 miles, then back is 7, down to the 'bottom' of Beach is about 3 miles and back is 3 miles - so a 'circuit' is about 20 miles. You can add a 'down and back' for another 6 miles to make 26 miles.
Run: Run to the 'bottom' of Beach is about 3 miles and back is 3 miles = about 6 miles.
You can add run miles by going further up Beach Drive.