@xec never said that travel is bad.
Global tourism is not new, but in many places, it has exploded with the cheaper and cheaper airfares (
see Japan's tourism growth in the past decade in table 1.2).
Some places are capable of absorbing huge numbers of tourists. I live in NYC, the most touristed city in the US, and it's never bothered me here. Elsewhere, places like Venice are on
the verge of collapse from tourism.
In my opinion, there is a point at which a place no longer feels like it primarily exists for the benefit of its own inhabitants, and instead exists as a destination for well-heeled travelers. A lot of the authenticity is usually gone at that point; you're visiting the museum exhibit version of the place. (Tourism of natural areas, as opposed to urban ones, brings about a whole different set of challenges).
For the most part, I think such is the reality of a globalized world. Tourism dollars are hard to say no to, especially for localities that don't have strong economies outside of their services industry. I don't know what is the right balance to strike.