Takes about 30 min on the no.22 bus from Waikiki beach. These only run to the bay about one an hour at some times of the day, so can be a bit of a wait unless you get a bus timetable.
Some great birds to be seen on the way from the bus down to the bay entrance, including Java sparrows. Also, check out the waste-bins! On both our visits, we saw mongooses dipping in and out of the bins.
Entry was $7.50 each. There is a mandatory introductory video - a very good idea to help protect the reef. If you re-visit within a year, you can skip the video as long as you sign to say that you have seen it and it gets entered into their database.
Once down on the beach, it is possible to hire snorkeling gear- $5 for mask, $5 for snorkel. The reef is close to the shore and very shallow - it can be tricky not to graze it or yourself. The fish are many and various - it really was like swimming in an aquarium. I'm not a good swimmer or snorkeler, but I managed to see a lot of different fish, so was very happy. There are good, clean toilet and shower facilities. The sand is lovely to walk on and there is also grass to sit on if preferred to the sand.