Know something about the Tiki bar? Bet you don't. But if you read the latest issue of American Heritage, you'll find out how it all started, and its history is tied to one of Hawaii's favorite drinks, rum. My aunt keeps every issue of American Heritage. She told me she likes to read about things one does not ordinarily read in the daily paper. She's right. I've read American Heritage several times, and every time I finish reading an issue, I feel like I've just done a semesters work in history and politics.