It's no exaggeration to say there is an 'arms race' when it comes to building new cruise ships. With interest in cruising booming over the past decade, cruise lines continue to plan and build new ships -- and each one seems to be bigger and better than the one before. Whereas a decade or two ago you might enjoy a ship with a pool and a rock-climbing wall, new ships today have everything from go-kart tracks to waterparks to roller coasters. And that's just for activities by the pool. Head in...
