Seismic/volcanic activity - there are over 100 volcanoes in southern AK and the Aleutian Islands and earthquake tremors are common in Fairbanks.
The Lights - aurorae are quite spectacular at high latitudes.
Global warming - Don't buy it? Then join the Flat Earth Society . . . there are plenty of signs of it here.
Atmospheric phenomena - the arctic is a great place to see all kinds of atmospheric optical effects!
Glaciers and Sea Ice - Despite global warming, Alaska still has quite a bit of ice.