speed humps and speed tables (longer humps, like a mesa)
speed table and intersection painted "warnings" of jaggedly lines on the ground
wobbly striped roads, lol. so few lane lines and dashes
well paved roads (so few potholes), and quite a few road closures due to either construction, or more often, tree trimming
fewer street lights and sometimes very yellow ones, to create a more dark sky environment
many 2 lane roads with 1 lane bridges
fewer asshole drivers when merging (either ending lane or merging lanes)
slower speed limits (nothing higher than 55mph!) and people pretty much respecting them. ...also speeding tickets are only like $137, ask me how i know, lol
very few official police cars (most are personal vehicles with a blue light bar on top)
many abandoned cars on the side of the roads
corrugated metal roofs in hilo
so many small churches with very pointy steeples
glass shutters instead of paned windows to help with air circulation during rain
has something like 10 of the world's 14 climate zones (unclear how many climate zones there are, and even less unclear how many hawaii has, lol)
more local ads on tv and radio (fewer "big box" stores, after all)
island music on the radio. many stations.
chickens everywhere, and rooster farms!
affirming signs: smile, enjoy life, you rock
lack of 18 wheelers
trash / transfer stations / stores
bilingual announcements in hawaiian language / most road signs and place names in hawaiian
asian influence - food, snacks, 7/11!, language (auntie / uncle)
lots of thai food. outside hawaiian, american, and japanese food, it seems like the most popular cuisine
sweeter foods (including bread), plate lunches, heavy, dense food without veggies
roadside fruit / food stands. many of which are outside homes, in little wooden stands, and a lock box for the honor code
ridged aluminum cans (article about why)
screened lanais
kapu signs all over
irregular business hours
lei fridges in almost all big grocery stores
tsunami warning sirens
foot push pedals at some crosswalks
kauai - "try slow" hand-painted road signs