My basic routine quickly became cycling each morning followed by snorkeling and sight seeing broken up with bouts of eating and reading. On one afternoon snorkel, I had a close encounter with a green sea turtle. I followed the massive beast for about 10 minutes while it glided along the reef. What fun! Too bad I didn't have an underwater camera with me.
Oahu has a number of excellent food trucks and many of our meals were taken therein. One such stop was the Shrimp Shack near our home base of Punalu'u. Coconut shrimp was excellent.
Best shave ice was in Haleiwa at Matsumoto's. These treats were large, luscious, and quite inexpensive. Every time we visited, there was a line out the door. Great with vanilla ice cream!
One afternoon we spent wandering Waikiki and hiking to the top of Diamond Head. Waikiki was not too crowded and the views from Diamond Head were spectacular.