Plot: Chilling out in Puerto Vallarta, the jewel of the Mexican Riviera, Rick gets thinking, not surprisingly, about food. Can he find the kind of authentic, mind-blowing, soulful Mexican food he loves even in a tourist Mecca like this? Rising to the challenge, he embarks on an all-day eating fest that turns into an invaluable insider’s guide to “eating local,” with tips on how to find the real thing amid the glitzy pretenders