There is no reason to book with the cruise line, book direct. If you care to?? see if you can pick up a toursaver book and use a 2 for 1 coupon, then resell it if you are going early or buy a used one if going later. My clear preference is a summit flight, over the top, the only company that does them that I know of is Talkeetna Aero. I have done several flights out of there including the ski planes. Misty Fjords is also very scenic, and it may also depend on your flying experience??? Especially if you haven't been in a float plane? But if you get a coupon, then maybe you can do both?