Lake Perris is a highly pressured lake with a ton of exposed brush and trees. There are few rock piles, and some riprap areas as well. In a recent trip the spinnerbait produced a couple bites and one 3-4lb class fish. A drop shot in these trees is also a good option. Pay attention to your electronics and don't be afraid to vertically drop on fish using the tress for cover.
Largemouth Bass