From SDMBA:

Trail Work Cowles Mtn's Mesa & Big Rock Trails (aka "Little Noble")

Saturday, September 6th, at 7:30 a.m.

Let's kick off a new season of giving back to the San Diego trails we love. If you don't already ride Mesa and Big Rock trails, come discover the best six miles of technical trail San Diego city parks has to offer. If you already ride these trails, you know they need some care, so come help them out!

Due to the dry conditions this time of year, we won't be doing tread work. Instead, we're working on something these trails really need, which is improving sight lines for all users through brush reduction.

We'll meet at 7:30 a.m. in the parking lot at the north end of Lake Murray Boulevard. We will be walking north on Mesa Road to meet the ranger at the Mesa trailhead at 8 a.m. so don't be late. We plan to work for about four hours. Our generous sponsor, Big Ring Cyclery, La Mesa, will be giving away some great swag after we're done.

Bring your usual protective gear like a hat, eye protection, sun screen, work gloves and boots. Long pants and shirts are recommended. We'll provide the tools.

RSVP to maggie AT sdmba DOT com

Directions:
SR125 to Grossmont College Drive, head west on Grossmont College Drive.
Left at Highwood Drive, then right on Lake Murray Blvd. Drive to end of road and park.

Google map location

Thats a real fun DH.

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this is simply an everyday tale of life, longing and mindless vandalism. everything is true, especially the bit where we all lie.