1.6 hr
Las Posadas is a research forest located in Angwin. It's composed of many criss-crossing trails through manzanita and oak, making it mostly shaded. There are some fire roads and easy drops, but nothing overly challenging. That said, expect a few technical sections and you can access more singletrack with additional challenges throughout to up the mileage.
Awesome view to the east from a overlook near the northerly area of the trail system!