Del Valle Regional Park mtb trails (Livermore) - Intermediate to Advanced

E-mtn highly recommended. If not on an emtb, you need to be in very good shape to tackle the steep hills here.
From Folsom, it's about a 2 hour drive each way. Forecast calls for sunny and highs in the low-mid 60s!
Watched a bunch of videos from there, and it looks soooo fun. I've heard that the trails are steeper than they look (mostly blue trails), but they are very flowy (mostly) with pretty good sightlines... shouldn't be many blind corners like we have locally.
Meet in the parking lot past the main gate between 10:45-10:55 with wheels up at 11:00am. Figure we'll ride for 2-2.5 hours or so, 20 miles and about 2k-3k elevation gain overall. I've never been there, and I've heard the trails are steeper than they look on YouTube.
Carpooling is encouraged.

Del Valle Regional Park Main Gate, Livermore, CA 94550
Address: 7000 Del Valle Road, Livermore, CA 94550

Toll Free: 888-EBPARKS (888) 327-2757, option 3, extension 4524
Del Valle Visitor Center: (510) 544-3146
Marina: (925) 449-5201