Almost all of the San Felipe Valley comprises the “ San Felipe Valley Wildlife Area”, which is controlled by the California Department of Fish and Game. Some of the Area is closed to public entry all of the time. During the summer months, June, July, August, the entire Area is closed to all public entry. See the map at this website: https://nrm.dfg.ca.gov/FileHandler.ashx?DocumentID=87881&inline
Clearly there is an exception for the highways. But the Area is on both sides of the highways. If you land on BLM property at the San Felipe Hills you are not allowed to walk to the highway. The North end of the San Felipe Valley has some privately owned property. Some quite level and almost like a meadow. The North end is also where the Sheriff station is located. It is at the small gray triangle next to highway S2.
If you are forced or choose to land in the San Felipe Valley you risk getting a trespassing ticket from the Sheriff, or some kind of ticket from a Fish and Game Ranger.
For more information on the Wildlife area: https://www.wildlife.ca.gov/Lands/Places-to-Visit/San-Felipe-Valley-WA
Note that Laguna is listed as a Sensitive Site. For this and all the Latest Laguna Site Protocols, Be sure to check the Laguna Site Guide for updates each and every time you fly.
The entire San Felipe Valley, including the usual Banner Emergency landing areas, are closed for the summer to all use, including foot traffic, and is being actively monitored effective June 1st 2017 through Aug 31st.
The San Diego Hang Gliding and Paragliding Association