What is the main conflict in The Innocents Abroad by Mark Twain?

For Mark Twain, the trip turns out to be a microscopic study into the nature of human beings. This includes, not only his ship companions, to whom he grows unnaturally close, but the people of cultures foreign to his own. Twain muses on his own American arrogance, his ignorance of foreign customs, the even greater ignorance of his travel companions and the grandness of it all. The excursion, however, is not as glossy as the original program advertises. Each feature, in reality, contains a flaw or slight misrepresentation that Twain is cordial enough to point out as he passes it.