THere are at least three wonderful options for Alaska that do not include the mega ships.

Alaska Marine Hiway: the ferry service that runs from Bellingham, Washington state up thru the inside passage & on up to Anchorage. Limited cabins (book online as early as you can make plans!) or deck/tent/chair accoms. http://akmhs.com/

World Explorer Cruises: a learning-oriented, laid-back cruise that does not focus on food, glitter or glam. http://www.wecruise.com/

Cruise West: small-boat, intimate cruising with accoms onshore at night. Up close to wildlife, very educational. Not cheap. http://www.wecruise.com/

Gail In Eugene but never for long