But for good snorkeling, you want coral, not sand! Other than Hananamua (sp?) Bay, we have not found any GREAT snorkeling spots on Oahu, not saying that there are none, we just haven't found any. We did find several areas where there were absolutely NO fish

, but that's another story. We did think that the snorkeling just off the Hilton Hawaiian Village, out a few hundred feet, by the underwater reef, was fairly decent. Our best snorkeling was in Kauai and the Big Island.
Good luck.
DD