If any climber is on O'ahu for an extended period of time and wants to try someplace other than Waimea for bouldering, a couple of decent places are the Lanikai ridge trail, and the Helemano Bug Park. The Lanikai has some awkward, chossy V0-V5 routes and Bug Park has a wide range of problems all throughout the dry creekbed (there are a few boulders upstream too). Both are worth checking out for a day if you're in the area (especially Bug Park if you happen to live around Schofield). Here's a couple of topo pics for each. The top is of the Lanikai and the bottom is of the upstream unnamed boulder at Bug Park (I forgot to take a picture of the main wall).
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