Used to be a bumper sticker, "Welcome to California. Now go home." Truer words were never spoken. So avoid the summer when the crowds invade everywhere, especially the beach areas. Skip this summer with the drought. To really see and enjoy the state, take the amount of time you are talking for just California. Take your time. Quick example. About a decade ago, we spent 2 days at Betabel RV near Gilroy. Liked it as an access point to Monterrey, Santa Cruz, etc. Spent 3 weeks there last fall and never ran out of things to do. And not just California. Take,your time everywhere. Our one week stay in coastal Alabama last winter turned into six. Never did really make it to Florida! Maybe next year!