Kenny Chesney has borrowed Jimmy Buffett's subject matter for years, and now it looks like he's after Norah Jones' tempos. The country hunk's ultra-mellow new record Be as You Are makes beach living seem like one long hammock nap. Problem is, his sun-baked characters the Boston transplant, the wistful barmaid, and especially the earnest narrator are too lazy to be interesting. Bummer. Chesney deserves props for straying from Nashville conservatism, but he's still a long way from ''Margaritaville.''