Hawaii Five-O

So occasionally, when kayaking, guests make some comment about Hawaii Five-O. I was raised without television and the last season aired two years before I was born, so I don't get it, but I took the time to look it up and it must have something to do with the closing credits, 'cause Wikipedia says 'The closing credits repeated the theme music over a short film of either some outrigger canoeists battling the surf or the top of a motorcycle unit...'