Share 'Must Do's in Anchorage'

I will be arriving in Anchorage next Thursday evening, and will be there through Monday morning. I would love if anyone has any suggestions on places to eat, museums to see, trails to walk, best photo opps...anything and everything. I want to pack as much into the four days as possible! I will be staying at the Spenard Hostel, so I'm not too far from downtown, but willing to go anywhere in the ...