Fountainhead park outside DC really is a gem. I've been disdainful of it a little in the past...I always respect quality trailbuilding, and this place is a great example of using small terrain to great effect...but local riders act like it's the North Shore sometimes.
That said, the effort and pride and stewardship here are obvious, and people really seem to understand the value of having a purpose-built, dedicated bike area in a place that's overwhelmingly crowded, multi-use areas. And the constant short-to-medium-length ultra-steep climbs completely smoke my winch-and-plummet ass. I put gears back on this bike for this trip, just because I know I'm not strong enough to singlespeed here...if I use a gear that I can reliably climb on, I can't move at more than a crawl when it levels out.
And on this bike especially, doing the full-park loop here is absolutely brutal...the chunk on the black loop is murder on the rigid.