Rosey's surfboard when paddling out has a small black handle attached near the back and when riding the surf in, has two large white handles. When on top of Kono's car, no handles were visible.
Kono says, "...we can always head down to the South Shore and try out some of those knee slappers" to Rosey, implying that they are currently on the North Shore where the big waves are. But, when they are in the water, they are obviously off Waikiki as you can see the hotels behind them -notably the Hilton Hawaiian Village- an obvious product placement of a sponsor.