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If you are driving to the North Shore on Friday, you might see if you can squeeze the PCC the same day. Kahuku, where the PCC is, and the North Shore are not too far from each other but both are well North of Waikiki and town. It'd be an exhausting day but a good way to maximize time.
I you choose to do the PCC on Saturday, definitely rent a car to get there or use the PCC shuttle. I wouldn't recommend riding TheBus that late at night out in Kahuku solely because the frequency may have you waiting awhile.