Alaska is enormous—it's two times the size of Texas. And crossing hundreds or thousands of miles by plane, train, or automobile isn't cheap. The solution? Set sail. Cruising is the most popular way to tour Alaska—and it may be the cheapest, too. The destination has been drawing more and more ships (Disney Cruise Line began its inaugural Alaska season in 2011) since the state's government decreased head taxes on cruise-ship passengers. For an amazingly economical Alaska vacation, book a cruise during shoulder season. As of this publication, we spotted weeklong spring and fall Alaska cruises on our sister site Cruise Critic's deals page on sale for as little as $569 per person.