Difficult Run is a scenic loop trail and is part of the Gerry Connolly Cross Country Trail system. If you follow the trail, it will lead you to the Potomac River and into parts of Great Falls Park, towards the Potowmack Canal. However, as parts of the trail are along water, keep in mind getting to Great Falls is a hike, may be difficult or impassable if trying after a storm. The area does become quite muddy and has potential to flood. The park is located on Georgetown Pike approximately .8miles from Great Falls Park entrance. If you are coming from 95, the park will be on the left once you pass Scott's Run Nature Preserve. It is easy to pass as the entrance is at the bottom of a slight hill. There is a sign at the road's edge guiding you into a small dirt and gravel parking lot. Use extra care when leaving. Due to the bends on each side of the park, it is difficult to see and should there be a speeding driver approaching, he / she won't see you until the last minute. Despite this, the park is worth seeing should you be in the area. Note: I have not used GPS to find. However, I see many comments complaining about the directions provided. Should you have issues or can't find, drive along Georgetown Pike from Great Falls Park on Dominion Road. It would be on the right approximately .8miles. read more