or if you have a sense of adventure just do the trip in feb. i did and LOVED IT!. you get to see AK at it's best - what it's known for - WINTER!
plus the northern lights are at their best in winter.....i can say i crossed the arctic circle with a thermometer bottoming out at -70F. saw the start of the yukon quest dog sled race and enjoyed all the ice sculptures around town in FAI.