The coolest thing we saw was at Glacier Bay. I brought my binoculars -- highly recommend you bring some if you go on an Alaskan cruise. As we are in the middle of the bay, looking at ice chunks floating in the water, I swear i see something swimming around. Must be an otter right? Maybe a harbor seal? I look through the binocs and this thing is huge. It's not an otter or a seal. It has paws! A brown bear or grizzly bear freaking doing the back stroke in the middle of the icy bay. It was crazy! Also saw a bald eagle perched on a large ice chunk. The wake from the boat made the eagle take flight right towards us.