Basically the cruise director is swapped for an expert in the flora and fauna of a region, who then guides passengers through the landscape. Usually more rugged, the expedition cruise still has some luxuries, but don’t expect the same facilities as on other cruises.
You can expect to see some of natures greatest sights. Typical expedition cruises tend to visit sights like the Norther Lights & Artic, the Galapagos Islands and other tropical island hopping destinations.
There will be the luxury of the ships on board resteraunts, buffets and cocktail bars.
Exhibition cruises tend to cater to adventure rather than utter luxury. Expect smaller set of facilities in favour for more adventeruous shore leave activities. Pack some walking gear.