I've never been to Kauai, but the pricing at the Maui Marriott is similar, and I've stayed there several times. I always reserve a garden-view room. When I check in, my Platinum status gets me a partial ocean view, no questions asked. Garden-view rooms aren't so bad, though; they look "back" toward the mountain. I don't believe that any room at Maui has parking-lot noise, but I could be wrong. Anyway, I'm not sure how much of this applies to Kauai, but a lot probably does.
Bruce