Editor's Note: Now-defunct Orion Expedition Cruises was acquired by Lindblad Expeditions in 2013. Read more in our Lindblad Expeditions profile.
Life onboard is casual. Sport jackets with or without ties are rare to nonexistent. The key players in the ship's staff are the expedition team, including one or more accredited experts in the sciences, history or culture, who provide background lectures, briefings, daily recaps and lead exploration trips ashore.
Dining is buffet for breakfast and lunch, and a la carte dinners served open seating. Entertainment is limited to one or two musicians.