Quality hike with good scenery within an hour of the DC area. The trail itself is fairly well maintained and rather rocky in some areas, but not overly challenging. Wife and I hiked the blue trail from the East lot up to 'White Rocks' which had some really great views and several nice areas to stop and relax before continuing on.
All in all, I think this is a really good, moderate trail which will give you a solid workout.
Trails are fun, but my personal hike is from the top left parking lot onto the closest trail, then through the woods towards the side of the mountain and then climbing up the face. Absolutely fun time and if recommend it to people looking for a more difficult climb at sugar loaf. I have to say this though; BE CAREFUL. It's extremely dangerous and I believe someone has actually lost their life doing this. Recommend skilled climbers only to try this.
My husband and I did two different hikes: Blue (with a little White) and Yellow. Blue is pretty rocky with a few steep inclines and about 5 mi total, and Yellow is much flatter (but still rocky) along the base of the mountain and clocked in at 7 mi. Blue has a great view at White Rocks, but Yellow doesn't have a summit, so no epic vistas.
Parking is tough; we drove up near Strong Mansion and a lot of people just parked in the grass, so we joined (w/no issues). Grab a map! It's really helpful. There are a few Port-a-Pots, but no real bathrooms.