I used to be a 'forecaster'...
I used to be a 'forecaster' for a telecommunications company, and travelled to Maui to literally count houses (to determine growth rates for subdivisions). I got to drive to places people don't usually go. In Kahului, find the Heiau (sacred temple) that's located on a bluff, accessible from a residential subdivision. It's difficult to describe how to get there, but the subdivision is located behind the Wailuku Industrial Subdivision (in fact the heiau overlooks the subdivision and the entire bay). Don't disturb anything, but read the plaques that explain the significance of this temple to ancient Hawaiian culture. By the way, the heiau looks like a bunch of stone walls or piles of rocks, but it was the base for a place of worship and sacrifice. While you're in the area, look around at the houses, especially at any vacant lots in the subdivision. The ground is all sand. This area of Kahului is comprised entirely of sand dunes, and all you get when you dig is beautiful white sand. The place was gorgeous when it was under construction.
If you can find it, especially in the winter, Jaws is where the really really good kine surfers go for tow in surfing. I only reccomend this for viewing not the actual surfing.
Ask around they may or may not tell you where it's at