Snorkeling with sea lions
Photo: Snorkeling with sea lions / Lindblad Expeditions / Michael Nolan

4. Be ready for adventure.

Expedition cruises are all about getting off the ship for long days of exploring, so physical fitness is important. Expect active days venturing ashore in Zodiacs, kayaks, or canoe launches. Daily excursions, which are often included in your fare, include things like swimming, snorkeling, hiking, and plenty of walking. A Hurtigruten expedition along the coast of Norway could also give you the opportunity to go dog sledding and snowmobiling. While the days are packed, the evenings are quiet, with the big excitement being expert lectures in the lounge.