Free or low cost overnight parking in SoCal? Lake Forest ?

I'm sorry but I'm not up on Lake Forest and the OC, I can tell you however there isn't much in So. Cal. that is low cost. Check the State Park web site and the USFS sites, there is OC and SDC too.

I will say that you should check each and every one of the Freeby sites and not listen to the rumors. Some churches and daylight businesses will allow overnights also the Elks, Moose and Eagles will let you in for a modest price if not full of members.

I'm sorry and Good Luck.