Hawaii Five-O - that's the original version from the 60s and 70s with Jack Lord, not to be confused with the rubbish remake (why have they even bothered! :() Jack Lord was inimitable and the theme music and opening titles are classic and unforgettable. Sigh.
Hanauma Bay: snorkeling in a nature preserve. No need to pay for "a tour". Drive up, park for a buck, pay seven dollars and fifty cents to get in, take the dollar trolley down the hill, remt snorkeling gear and enjoy one of the most beautiful spots anywhere. Go early. It fills fast and they close access when it does.