Meet at the public bathrooms before heading out on the PG&E Trailhead (see below map).
Parking: Parking Lot 1 is closest to the meetup spot, but if it is full, Parking Lot 2 is not far (see below link to the preserve website and click on Directions & Parking)
Rancho San Antonio Preserve website link: https://www.openspace.org/preserves/rancho-san-antonio
Map with meetup location: https://maps.app.goo.gl/8BdRFzMXQz3SfyPV8