I know its a little while for this post BUT if you come up toward me on 15 from where you are (you can hit it a hundred ways just heading west) and work your way up, hit 340 into MD, just after you cross the bridge by Harpers Ferry veer to the right on Keep Tryst Rd until youhit Sandyhook Rd and follow that right along the C&O Canal, follow that until the second road which is Harpers Ferry Rd (cant go wrong, there are ONLY two roads. The first is Hoffmaster Rd if you miss them the road ends in a nice area to take a break) then take a left on Back Rd (it will again take you along the Canal PLUS it is windy and fun), then a right on BullneckRd which will hit Harpers Ferry Rd again, then it gets interesting, you take a left on Harpers Ferry Rd (even though it continues straight also, the intersection is strange), then back to the Canal on Limekiln Rd (which Harpers Ferry Rd becomes) and that will take you several miles until you hit Harpers Ferry Rd again BUT GO STRAIGHT instead of right), it becomes Canal Rd for several miles to Sheperdstown Pike (at Sheperdstown), take a right and it will take you into Sharpsburg where you can tour Anteitam Battlefield (great riding roads through the battlefied), follow 34 to Boonsboro, then you have a huge amount of options as you run in Rt40 in Hagerstown which runs either to 81 or 70. Either way you go is great fast ride home or wherever else you would like to go up north. It is just a couple hour ride but so very nice. From Boonboro there are small roads that lead up into South Mountain Battlefied. Absolutely beutiful with views of the entire valleys on both sides. Take a look at MapQuest, etc., about the route sp you have an idea. You cant get lost unless you want to.
This is where I do most of my riding living up here outside Frederick.