There was a time when I considered tequila a mere prop for frat parties and killer hangovers. Then, last Christmas, I visited Mexico City, where I was schooled in the way of the premium blue agave. Rule no. 1: Sip it, don't shoot it. Rule no. 2: Drink it out of a glass, not a bellybutton. My favorite of the bunch was Sauza Tres Generaciones. Smooth, rich, sweet, wet--whatever, it was damn good. And the best news? Good tequila doesn't give you a crippling hangover. Someone tell Tara Reid.