This is a moderately difficult 7-mile paved trail through the Angeles National Forest. It is great for a hard workout, if that's what you want to make it, but it's also very rideable for most. As you pedal along, be sure to enjoy the beautiful river running parallel with you. Also, take in the views of the surrounding trees and nature.
What Makes It Great
This route usually isn't very crowded during weekdays, so that's a nice time to attempt it. There are park amenities along the way such as restrooms and picnic areas. The route starts off fairly easy with gradual inclines towards the end. You finish at the top of Cogswell Dam, which is a pretty impressive structure. You do need an Adventure Pass to park and access this trail, which you can find at the nearby Ranger Station or AM/PM store. This trail will make you feel like you are far outside of the city, which is amusing because you're, in fact, only 30 miles away. Enjoy!
Who is Going to Love It
It's a paved bike path, so riders of all levels will enjoy it. It's rarely crowded and anytime you can get in miles without traffic whizzing by is always a plus.
Directions, Parking, & Regulations
From MTBR.com: Take the 210 Freeway to Azusa Avenue. Exit and head north (towards the mountains). Follow the road past the Morris and San Gabriel dams. Continue north past the East fork Junction and the off road area. Just beyond the forest service station, there will be a dirt area to park right before the west fork junction, and a paved area right after. Park in either location and look for the road with the bar in front of it next to the dirt parking area.