I haven't lived in Alaska, but I've been to Anchorage for work several times and also biked from Fairbanks to Anchorage (Alaska AIDS Vaccine Ride, 2000, only had to turn once as we took the Richardson Hwy to the Glenn and on the outskirts of Anchorage we enjoyed the bike trail (lots of chipseal and worse on those roads out in the boonies!).
I live in the Seattle area, so I'm used to longer days in the summer, but in Anchorage you'll get 19-20+ hours of daylight in the summer! Then you pay for it with very short days in the winter, so you may want to consider morning kindergarten in the winter, if that's an option, so that your kiddo can have a bit o' daylight after school for playing...I've been up there in December and remember it getting dark by mid-afternoonish...
That being said, I moved to the Northwest ("rainy Seattle" and all that) from Puerto Rico, after enjoying living there, the beautiful weather, playing tennis, etc for 3 years and it didn't take me long at all to love it here more than anyplace else I've lived. I wish the same for you and your family.
Best wishes in your move and new life...enjoy!