Yeah, it's everywhere on the Islands. In fact, I tried a Spam dish at one of those L&L Hawaiian Barbeque fast-food joints. Overall, the food there is okay - but I'd skip the Spam Musubi. Basically a chunk of grilled Spam and a wad of sticky white rice, wrapped up in a hunk of seaweed. It may just be my individual palate, but the taste of Spam just doesn't go with seaweed - or vice versa.
Otherwise, I like the stuff - especially dunked in an egg wash, rolled in bread crumbs and pan fried. It's an angioplasty on a plate, but damn, it's tasty.
I used to be recreation director at a Summer retreat which each year had around 30 Japanese Students. Every year they would put on a “Japan Day” in which they would perform Japanese acts, serve Japanese food etc.
Some of the food such as the small bits of grilled chicken were delicious but the seaweed dishes were just plain inedible. I would see the American kids slipping up to a garbage can and when no one was looking, quickly drop the stuff in the can.