Lucky Duck Solicits Advice for Trip to Anchorage

So, on Friday my mother-in-law asked where we wanted to go. Saturday morning I woke up to find two messages in my in-box with E-Ticket confirmations for our trip to Anchorage! Needless to say, we are PSYCHED. We are leaving August 17 for about 6 days. Has anyone been there? Any tips on where to go and what to do? I hear that August is the perfect time to see the Northern Lights.