I love blockhouse trail. It's right off river road, you park on the side of the road, and go for a walk (kind of a hike) and end up on a cliff that overlooks the Potomac river, and part of the C&O canal. The views are beautiful especially in the summer and the fall. It's one of my favorite places and I'm going to miss being able to get to it in ten minutes next year.
Oh by the way, 13 days til college. I'm not panicking. Not at all.