This hike will take approx 6-7 hours. Start early - The Sierra Azul Open Space Preserve is open at dawn (6AM mid April). You'll need LOTS of water, sunscreen, and protection from poison oak, and insects. You should familiarize yourself with what poison oak looks like and strive to avoid it. Consider taking your camera as there are plenty of wildflowers in the spring, and lots of views of the Valley below.
This is an end-to-end hike, and assumes you have some other means of getting you back to your car at the starting point, such as having someone pick you up at the end of the hike as I will.
Start this hike at the Woods Trail Parking lot off Hicks Road.
NOTE: You could take the reverse route of this hike, but note that the elevation gain is significantly greater over a shorter distance.
Take the Woods trail as it ascends gently at first but then more steeply, with Mt. Umunhum's prominently visible 5 story square building on its peak. At aprox 2.5 miles, you'll reach Barlow road on your left, but continue on Woods trail as it now steeply ascends the mountain.
At 3miles you'll begin climbing more steeply, climbing ~163ft in the first 1/2 mile, but then 352ft in the next.
At 4miles, and 2271ft of elevation, you'll continue the steep ascent, covering 521ft elevation gain.
At 5 miles, you'll continue climbing another 1/4 mile and 164ft in elevation, reaching the peak of this hike at Mt Sambroso, at an elevation of 2956ft. From here' you'll be nearly flat descending very gradually.
At 7 miles, you start a more steep descent, losing 504ft in elevation over the next mile.
At 7.25 miles you'll reach the junction with Priest Rock Trail on the left. Turn left on Priest Rock Trail.
At 8 miles the descent gets slightly less steep losing just 287ft over the next mile
At a little more than 8.5 miles, you'll meet back up again with Limekiln Trail, but continue on Priest Rock Trail.
At 9 miles you'll get to the steepest angle of descent losing 600ft in elevation over the next mile
At 10 miles, the descent eases up slightly as you heard toward Alma Bridge Road, and Lexington Reservoir just below it. You'll drop another 455feet.
The route ends at the parking lot just to the left at the end of Priest Rock Trail.