Business travelers should avoid signing any contracts on monday, while leisure voyagers would do well to double-check the fine print on any special deals, coupons or tickets. You're all eyes and ears from tuesday through thursday, and it's the perfect mode for absorbing your destination without leaving your own imprint on it. Bonus: when you do engage, people listen. Around friday, doing a good deed is its own reward (not to mention that it boosts your travel karma). Sudden changes are more likely the rule than the exception this weekend, so be ready and be flexible.