1. You should try orbits.com to find the cheapest way to oahu but you have to remember that getting things cheap is not always a good thing try and go with aloha airlines for cheaper tickets
2. I'm not sure if this is the cheapest way, but I took a cruise to all the Hawiian Islands for my honeymoon a few years ago, and it was GREAT!! Everything (room, board, entertainment, etc.) is included in the price of the cruise. It was the best vacation I ver had.

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