Usually, you go on vacation for one of two things: to relax and leave the daily drudgery behind, or to have an experience and learn about different cultures. Either way, you can end up with more of an adventure than you planned for, and as much as you might want to learn about other cultures, that can come with some shocks.
Even though often you don't even need to leave your country to take a step into a weirder world, it sure helps.