The boat ride to Holgate Glacier is a long one-- it's not keel-over-the-side-and-disperse-stomach-contents rocky, but I would definitely take Bonine if you're super-prone to motion sickness (just in case). You're given a wildlife list to check off along the way-- out of 41 species, I checked off 29, including bald eagles, gulls, ducks, orcas, sea otters, mountains goats, and steller sea lions. Having said that, I would have been content just to wave to passing fishermen emerging from the mist in this surreally fairy-tale-like seascape.
Next to the giant Holgate Glacier, our boat floated among ice chunks as we ate dinner from a glass-enclosed dining room. After dinner, we motored along the fringes of rock outcroppings to view groups of sea lions and thousands of puffins. Just as we were returning, a giant humpback whale fluked not more than 20 yards away. Though a bit steep in price, this tour was worth every cent.