I'm usually pretty ok on boats as long as I can see something in the distance other than the horizon. Too far into open water and I get disoriented and queasy. The same feeling happened to me the first time I drove across country. I had fallen asleep (passenger side) and when I woke up, we were in Nebraska, and I'd never seen anything so flat for so far. Waaayy out in the distance was a tiny tree. I momentarily panicked, then decided to go back to sleep. Talk about avoidance.
G, I've heard so many good things about cruising Alaska. Please take many pics!