Well, I'm certainly confused.
Which option have you decided on? Are you driving out and back, or are you flying and driving back, or are you just flying and driving around?
If you are looking for islands, you could try the Channel Islands a National Park in Southern California. I can't really think of many other island options.
Reno and Vegas both have plenty of casinos to walk around in. And there are a million possible scenic drives in the two states. It depends upon where you are heading and how much time you have.