Hawaiian beaches have it all -- great snorkeling, surfing, windsurfing, diving and most importantly white sandy beaches for relaxation.
Molokini Crater is a dormant volcano with a living reef in the center making it the best place to dive and snorkle. Whale sharks like to hang out on the back side of the crater so check them out. (They eat plankton so don't let their size intimidate you. If your chill aroud them they'll be chill around you.)