Southeast of Honolulu on Oahu, the snorkeling at Kewalo Basin is well known for the scenic reef. Unfortunately, like the rest of Waikiki Beach snorkeling, the Kewalo Basin is not known for good water clarity. It has very poor visibility. For the best snorkeling at Kewalo Basin, try for a windless day with low surf and no rain on the days prior.
There is parking for the Kewalo Basin snorkeling in the Ala Moana State Recreation Area.
After a long day of snorkeling at Kewalo Basin, grab a cool drink at the La Mariana Tiki Bar in Waikiki. To reach the best snorkeling on Oahu by air, you will need to fly into Honolulu International Airport (HNL) which is located just on the west side of Honolulu. There are direct flights into Honolulu from the US, Australia, New Zealand, American Samoa, Tahiti, Japan and Fiji. In addition, there are inter-island flights to all the main Hawaiian Islands. There is good snorkeling on Oahu year-round. But, the conditions very around the island depending upon time of year due to winds and currents. The north shore snorkeling dives are best from June through September and are usually closed out the rest of the year due to high surf. The south shore dive sites are best from November through May. The main exception is Hanauma Bay, which tends to be good year-round since it is very protected.
Overall, Kewalo Basin is the 3rd most popular snorkel dive spot of all 23 snorkeling dives in Oahu.