We just got off the 8/8/16 Alaskan cruise as well. First ever cruise. (Loved it!) DD12 never felt any of the movement. DH felt the movement, but stomach was fine. I felt the movement, but just needed some ginger ale to settle my stomach at dinner the first night (Parrot Cay--where our bottoms were vibrating in our seats due to being far aft, deck 3.) DD16 (who gets an upset stomach when anxious anyway)--felt awful that first sea day, couldn't eat breakfast. She had sea bands on, didn't help her, gave her the Dramamine naturals--pure ginger, that helped some. I went down to Deck 1, Medical services--you don't need to see anyone. There is a bin down there with chewable Meclizine samples and tips to prevent/treat motion sickness. At some point when she felt so-so, tried her first with 1/2 a pill, helped some and no ill effects, she took the other half a couple hours later--then she felt great. She didn't need anymore until the last at sea day. Going from the glacier visit, to all 3 ports in the inside passage was fine--it was the times we faced the open ocean on 1 side. We were on deck 2, near the aft elevators--lots of rocking at night first and last sea day. Quite an experience! We went on an Art of the Theme Show tour on the last sea day. Even our tour guide felt the rocking of the ship--she said if you ask a crew member if they feel movement and they say yes, then you know it's really moving.
Of course now 3 of us feel the land moving...hopefully a good night's sleep will help out with that. We had an overnight flight and didn't get more than a few short naps in on the planes, and a 2 hr nap in this afternoon.