Oahu Day Trip - One or Two Days on Oahu

I am planning to be in Kona, Hawaii from May 17 to May 24 and would like to take in some
of the sights on Ohau such as Pearl harbor and the Cultural Center. Any ideas on the best
way to do this? I know each of these are at least a day in themselves. Maybe 2 trips or
an overnight stay to catch both? What might you suggest?

I would do an overnight stay in Oahu - otherwise you eat up too much of your day on the airplane, getting the car, etc. Plus that way you get to enjoy Oahu a bit - it really is very pretty. Have a great time!