Do you mean Mathews, Skinner, Elsinore and Perris? (And it should be 5, since Diamond Valley Lake is in the way and hard to avoid.)
I don't know much, except that I've been at campgrounds on Elsinore and Perris. Lake Elsinore area is sketchy, there are lots of cars and not enough bike lanes. Also, June would be the absolute latest to do this, or it will get really hot.
Don't go on Ramona Expressway, it's basically a freeway. Cajalco does not look too good either. In fact, I'd swing north of the lakes and try to make my way to Gilman Springs Road on smaller streets.