As more and more solo travelers head out on the high seas, cruise lines are responding with innovative staterooms designed for one. Best of all: These cabins are also priced for one, meaning you don't have to pay a nasty single supplement just because you decided to cruise alone. From the classic ships to the latest launches, here are the top accommodations for solo cruisers. Note: Book early to snag a spot, as these rooms tend to be very popular.