Waimea Bay is a well-groomed beach park with all the facilities.  Snorkeling can be good, as at times huge schools of small fish congregate right next to the shoreline.  Diving is excellent, too,  around the south point of the bay.
Between dives, you might want to visit Waimea Falls Park just across the road.  You can easily spend a couple of hours roaming the gardens.

Off Kamehameha Highway on the North Shore in the Waimea area.

Waimea Bay (wall)

My husband and daughters are kind of crazy swimmers and divers, but they wouldn't consider not jumping off JUMP ROCK.  They learned from the locals up there.  They also learned of a cave under Jump Rock you can hold your breath and swim from one side of the rock to the other.

Jensen's Dive Log

@jensen

1 dives