Kenai Fjords out of Seward is an awesome place to go if you want to see wildlife, whales, killer whales and many other sea life. These cruises come in half day (4 1/2 hours) up to a full long day of 9 hours! Not only do you see amazing wildlife but you get to see glacier calving.. something you should do!
Check out the Kenai Fjords day cruises here.
Check out this video of a glacier calving in Alaska!