When I was still a kid, we did a family vacation in our RV up to Alaska that was pretty good. My best memories of that trip where stopping at the road side stands to buy dried salmon, seeing moose and bears on the road, and then having caribou just standing on the road blocking traffic.
Since then I've been hunting in Alaska 3 times. Hunting Season is in September, so I can only comment on what it's like then. It rains a lot. The mosquitos are unlike anything you can imagine. Even with a full net over your head, they still get in and tear you up. It's like walking with a cloud of them all around you, all day long. The tundra is horrible to walk in. It' soft, wet and full of hidden holes that you fall into, over and over again. The mountains are loose rock that you slide down almost as far as you climb up. I've hunted most of the Rocky Mountain States, and nowhere is it as miserable as it is in Alaska. It's the worse place ever while you are there, and the place you want to go back to as soon as you get back home.
I've seen the Northern Lights in September, but they where not impressive. They looked more like contrails then anything else. Odd, white lines in the sky. I never saw any color, or anything exciting. Probably the oddest thing for me was that the sun would rise and set in almost the same place. It would get dark around midnight, and then be light again in a few hours. It could be very confusing getting back to camp if you relied on where the sun was.
The main reason to go to Alaska is to see the wildlife, the mountains and the glaciers. Anchorage is just another big city without anything to see that's worth the trip to get there, but once you get away from the big city, it all changes.
When my parents went there on their own in the late 90's, I had a friend of mine take them out flying on his plane. He showed them some glaciers, they got to see the mountains from the air, and they saw lots of animals. It was the highlight of their trip.
If I ever bring my wife to Alaska, and she wants to go, I would book a fishing trip that requires a float plane to get to camp. It would only have to be for a few days, but for me, flying in and out on the plane and landing on the water is the ultimate Alaska experience.