FRIENDLY advice from a local person can help make that visit to a new city or country a successful one. But before you follow the advice, you might want to run it by an independent source. Ben Schott, the author of The New York Times vocabulary blog “Schott's Vocab”, recently asked readers (many of them being New Yorkers) to submit humorous bits of bad advice for anyone who might visit their city. Here are some of the best – er, worst – suggestions: