June L. on Merryman's Mill Trail
awesome trail. children younger than 13 probably shouldn't go if you're going off the trail.
I've hiked around the reservoir many times. I've done hikes as short as an hour and as Iong as 5 hours. My favorite starting spot is off dulaney valley just before the bridge over the reservoir. From here you can take the service road on the left which leads down to the reservoir after about a mile. From there you can hike another 5 miles or so, weaving your way along the water. You'll see fisherman, turtles, lots of vegetation and not very many people.
I had some trouble finding the trail path. I parked along the side of Dulaney Valley Road and then walked up a hill along a large path. This was on the left side of the road if you are heading north. I hiked along there for about 1.5 hours total, plus walked down to the reservoir. I do not know where the large path led but it didn't have views of the reservoir, I think it was a service road. I saw about 6 other people there. I will return again to do a longer hike and print out maps beforehand.