Sup dude. I live borderline LA county and orange county and have access to quite a few small lakes. If you're looking for an underfished lake for bass you could try Prado lake in Chino. It's pretty tough to pull out some lunks from there, but there's a lot of decent size fish that are within the 1-3 lb range. I also sometimes fish Carbon Canyon lake in Chino Hills, I think. The lake is pretty small, but that place holds some toads.