Last time I snorkeled in Hanauma Bay, I had a great time. It was beautiful and I highly recommend it if you are staying in Honolulu. I do have to issue a heads up though.. since this is probably the best and most popular snorkeling spot on the island, it does get very crowded. I had to swim out past the inner reef to get any elbow room, but it was worth it... I have heard Hanauma Bay likened to a snorkeling Disneyland, but hey... I love Disneyland too.