Facilities are complete including a snorkel gear rental concession. There are several turtles that live there. Please remember it's against the law to harass or chase them. If you have never tried snorkling, perhaps a bit wary of the whole thing, you won't find a better place or safer to try it out. Kahaluu is protected by a breakwater and has an amazing variety of fish.
Further south is the City of Refuge, which is a national park.
In the back is a sandy area but no easy ocean access or showers. It's still a must see as I mention in the road trips section. Visit Dick Dresies website from my main page for more info. So that's it for beaches. Put plenty of sunscreen on and have fun.