South Georgia Island
Home to King Edward Point Research Station, South Georgia Island is another ideal location for researching atmospheric and astronomic activity -- in this case, magnetic storms and their effects, one of which is the intensity of auroras [source: Turbitt].
South Georgia is a possible auroral viewing spot, but the icy island is used almost exclusively as a research base. It's tough to get there -- boat and boat-based aircraft are the only options [source: BAS]. Most tourists who visit there (and perhaps glimpse the aurora in its skies) do so by cruise ship.
Finally, to the very, very south of South America.