Very tight time for oahu and big island.
you can fly from Honolulu to Hilo and rent a car to the vocalno national park. If you decide to see vocalno in the evening, go to park in the afternoon, so that you can drive to the volcano location early evening. The gate to vocalno doesn't open before a certain time, I don't remember, may be 5:30pm? Be prepared that the walk to seaside is not easy on hardened lava, and no restroom once you enter the gate; bring a flash light for your walk out and some extra clothes for evening.
I haven't been to PCC. According to my friend, PCC is more intersting in the evening, fun stuff starts at 2pm.
Have a good trip.
