I couldn't agree more for that reason to only take one blend on a vacation. I enjoy looking back on a trip and remembering it as "ah, the Dunhill Flake trip to Costa Rica". I usually am lucky to smoke once per day even on vacation, though, so I can easily see how others would disagree.1 pipe and one blend. I enjoy the self-imposed monogamy on a trip. Lets me really spend time getting to know the blend I took.
That said, I have historically brought two pipes with me just in case I happen to squeeze in an evening smoke back-to-back days. If its a camping trip, I bring more than one tobacco just because I will almost certainly smoke every evening by the fire.