This loop should be ridden in both directions due to the fact that it is totally different in both directions. Capitol can be accessed from the Lighthouse Trail or from a small trailhead off of Park Road 5 just after the Lighthouse Trail Parking lot. It is fun in either direction and if you can, you should ride it both ways.
It is probably one of the rockiest (if you can even say that about PDC) trails in the canyon, but it has great flow. Don't let a few sections of technical riding keep you off this trail, the payoff is worth a little skill-work.