This trail starts at Eldorado Canyon State Park. Drive to the visitor's center and hike north from there.
The trail climbs steadily through several switchbacks. After an hour or so it will flatten out and then descend to South Boulder Creek. From there, you can join the Walker Ranch trail. Watch out for bikes at the trail junction.
Eldorado Canyon is very popular with hikers and rock climbers. It will be crowded on weekends. Get there early to avoid the crowds.