Every visit to Glacier Bay is different, but there are many other places to see. I prefer Hubbard Glacier, for example, because it does an amazing amount of calving (but this year I went to Glacier Bay anyway).
I like the itiniary of glacer bay better (more sea days)...but still debating. Then I have to decide what month to go. Last time I went in September and this time I want to go earlier. There was not much wildlife at all to see then.