I voted for Hawaii. Not because it's already got experience as such (being so long ago, it wouldn't really be relevant anyway, or because it would satisfy conservatives by ACTUALLY making Barack Obama's birthplace a foreign country, or because I want to get rid of them. (Although the new Hawaii Five-O is far below the original in quality, even with the fabulous Grace Park.)
Rather, it's because it's got four things every independent nation needs:
1. A way to set up its own economy: All that tourism money means they'd be at least as well off as the better-off Caribbean nations. This is something the Quebec separatists didn't get: The federal government in Ottawa would have said, "Oh yeah? You don't want our government? Then you can't use our money. Good luck setting up and saving your economy."
2. A way to set up its own military: The U.S. would probably make a deal to allow Pearl Harbor to still take in U.S. ships & servicemen, but a Hawaiian Army, Navy and Air Force would be possible. This is something the "Republic of Texas" morons have not considered: Less strategically important than Hawaii would be, the U.S. forces would pull out, and the Texans would have to defend their border with Mexico with... with... with what, exactly? The State would be majority-Hispanic in about 5 years, and the conservatives would be out of power.
3. Universal health coverage, like every industrialized nation has. Except, of course, for America as a whole.
4. Good relations with the U.S. Everybody likes Hawaii. Except, maybe, for the birthers.