Where in Alaska are you going? I spent four summers working out on Bristol Bay, where the landscape is largely tundra. At the time, I used a Nikon F w/ a Nikkor 50/1.4; that was the only lens I had. My suggestions:
1) The spaces and vistas in AK are vast, quite unlike most of what we see in the lower 48 (some folks claim to see Russia from their house 🙄🙂). Cut back on the wides, and take the longest telephoto you've got for your M. I agree w/ what Tim Barker said.
2) Ever seen an Alaskan brown bear up close? These are not your Yosemite, garbage-can raiding, cutie pie black bears. On hind legs, an adult can reach 6'6" and run almost 30 mph. When I was working up at a salmon cannery one summer, a fisherman walking down a road got between a mother and cub. The mother charged, and w/ one swipe scalped the guy and punctured his lung. He was lucky to survive. Having watched these critters in action, I would not get too close. Hence the telephoto (you'll also need it for the bald eagles, foxes, and other fantastic wildlife too).
3) Frankly, if I were going to AK and wanted to photograph wildlife, I'd take an SLR and a 300mm lens at a minimum.
4) If you go in summer, bring LOTS of bug repellant. AK state bird is the mosquito.