Mexico presents a menu full of tough choices for travelers.  Cabo, Puerto Vallarta, or Cancun?  Tecate or Corona?  Jack Nicklaus, Robert Trent Jones II, or Greg Norman?  For golfers, our southern neighbor proffers a rare collection of oceanside desert courses designed by the best architects in the game.    Wide green fairways cross dusty arroyos, sweep past stately cacti, and often play down to the edge of the ...