A website setup to prank tourists was set up in 2010 called Hawaii Humor.Com
I just came across the following youtube clip and had a good laugh at the tourists that actually believed they were being filmed for a legitimate news station.
Hawaii Humor is a hidden camera prank show based on Oahu, covering all the islands with a Hawaiian flair. If your a tourist or a local, look out! YOU might get pranked by HawaiiHumor.com! With our unique blend of comedic pranks and special celebrity guest stars both local and from afar.
You can check out more about the site here: Hawaii Humor