This weekend, I went hiking at Great Falls with a friend from law school and one of her friends from college. It was great fun and I would highly recommend it to anyone in the DC area!!! We went to the Maryland side and hiked the Billy Goat Trail, Section A. According to Google (which is a totally legit source), the hike was 4 miles long. You have to climb over rocks, but the hike was not that hard.
Here are the three of us about half-way through the hike
Here I am with a kayaker behind me. I would definitely love to go back to kayak.