Hawaii: SPAM musubi
When you go to Hawaii, a few things are certain. You'll relax on a beautiful beach. You'll probably get sick of hearing ukuleles. And at some point, you'll be confronted with SPAM musubi, which is like a nice piece of nigiri, but with the highly processed Minnesotan canned meat product where sashimi-grade tuna should be. SPAM has been a favorite in Hawaii ever since it because a sought-after export from the mainland in the early days of its statehood, largely because it lasts forever. For mainlanders, it has baggage as a mystery meat. In Hawaii, it has clout as, well, a mystery meat. But hey, you're in Hawaii. If the worst thing that happens is you discover you still don't like SPAM, you're in good shape.
Idaho: Sturgeon eggs
Most Idahoans subsist on a steady diet of steak, fried chicken, tots, and tallboys. But the state is also the prime producer of American beluga. Which is a fancy way of saying American caviar. Which is a nice way of saying big-ass sturgeon eggs from Idaho's rivers. It apparently tastes like popping a salty miniature balloon full of fish goop and butter in your mouth. Also, it sells for more than $100 an ounce. So if you see it on a menu in Idaho… get the steak, fried chicken, or tots.