Antarctica

Many cruises to Antarctica (a preferred method of travel for the area) take place in the summer months; it's not nearly as cold as you might think. (Often, you'll see passengers above deck in t-shirts.) It has some of the most pristine wildlife viewing options in the world, and the Lemaire Channel will give opportunities for some of the best photos you've ever taken. Plus: the penguins. Interact with the penguins.