We are going to Hawaii in August. I will be participating in a race on Sat and Sunday on OAHU ISLAND, KANE‘OHE HI. I plan on getting 4 nights on Oahu at Waikiki Beach Walk and then planning on going to another island for 3 or 4 more nights. I am looking for suggestions on where to go. We would like some beach, but don't have to be right on it, but would also like to snorkel, see volcanos, etc. Thanks.