Yea it even struck me as a bit weird then. To each their own I guess but when I think Hawaii (or 1960s CA) I think of guys driving around in older muscle cars or in beat-up VW busses, possibly "woody" station wagons, not $90k sports cars. An old rich white dude driving a Porsche doesn't conjure up images of Hawaiian culture to me - someone of more Polynesian descent happily heading off to Waimea bay in an old station wagon with a couple of surfboards on the roof does. Just my $0.02. My Hawaiian shirts have flowers, palm trees and surfboards, not expensive imported sports cars.
But hey - do what makes ya happy.