Travel: Target for '68

Mexico has been invaded before. Complained a Mayan of the Spanish conquistadors: "They shriveled up the flowers. Without knowledge, without valor, without shame, they had only come to castrate the sun. And the sons of their sons stayed among us, and we only received their bitterness."

Today the country is undergoing another kind of invasion and faring far better under the onslaught. This year 1,300,000 U.S. tourists will journey south of the border to savor the strangeness and delights of a New World country that counts history in millenniums, boasts attractions as...