Recently a couple of friends and I ate our way through Kailua-Kona and found the best spot to watch a sunset.
An awesome fun, free activity on Oahu is the Makapu'u Lighthouse Trail and I highly recommend doing it between late November and the end of the February. To be more specific, we've had the best luck seeing whales in the month of February.
...between that, the beautiful views, great exercise and fabulous company I am calling our hike up Diamond Head a big win.
I turned to my trusty friend Google to locate a florist on the island from whom I could procure loose flowers the kids could string to make leis.