It might surprise you that introverts travel differently than extroverts, particularly because most travel magazines, guidebooks, and TV shows are produced by and for extroverts.
I don't seek people out, I am terrible at striking up conversations with strangers and I am happy exploring a strange city alone. I don't seek out political discourse with opinionated cab drivers or boozy bonding with locals over beers into the wee hours. By the time the hours get wee, I'm usually in bed in my hotel room, appreciating local color TV. (So sue me, but I contend that television is a valid reflection of a society.)
I almost broke my neck extensively nodding in agreement while reading this article. The author also has some tips for the introverted traveler. And if you haven't read it, Jonathan Rauch's Caring for Your Introvert remains one of my favorite things that I've ever featured on kottke.org.