Not Hawaii related, but asking for suggestions

[Radiopeg]

Humboldt County Avenue of the Giants gets my first place ribbon. Marin County (you can stand at the epicenter of the 1906 Quake) coastal area, Pt Reyes, Tomales Bay. Eat at the Sea Grill in Eureka if it is still there. Glass Beach FT Bragg. Once you get up to Mendocino (crowed, artsy), I'd go inland back to 101.

Peace and long life