On just about any Lindblad expedition, the primary entertainment is the destination itself, and you will remain busy with multiple landings and lectures. Wake-up calls are broadcast throughout the entire ship by the Expedition Leader starting as early as 6:30 a.m. (or earlier, if need be), and usually you'll be on the go until dinner. Happily, Lindblad usually works in a few hours of downtime during the day for a nap around lunch or before pre-dinner info sessions.
Landings on shore are the main activities, and these can vary tremendously by the region you are sailing in. In Antarctica, passengers are given fairly wide boundaries to explore on the landing site, allowing everyone the opportunity to interact with penguins on a more personal level; while in the Arctic, excursions ashore are more of the tightly controlled "follow the leader" type due to the threat of polar bears. On Mediterranean itineraries, you'll expect more of an emphasis on the culture and history of lesser-known ports, with walking tours, some Zodiac rides and kayaking trips likely, while the British Isles offer a mix of nature and culture.
Before dinner is the Lindblad tradition of Recap. Just about everyone gathers in the lounge for pre-dinner drinks and hot hors d'oeuvres, and several of the naturalists will give short presentations regarding what you've seen that day. There might be video shot by the undersea specialist on his or her dive that morning or a discussion on the feeding pattern of whales. At the end of Recap, the Expedition Leader will announce, as best as possible, the next day's plans and intended landings.
By the time dinner is done, most everyone heads to bed, although a few hardy souls enjoy some friendly camaraderie with the naturalists in the bar for a few hours. During longer ocean crossings or less intense voyages away from the polar regions, more evening activities or lectures might be scheduled.
For many, photography is a key activity, and there are few better laboratories than the N.G. Endeavour to hone your skills. A National Geographic photographer (in addition to a Lindblad professional photographer) accompanies every sailing and helps you get the perfect shot. There are usually seminars and presentations, which may include showing sample photos taken by passengers during the week in an effort to illustrate what they did right and wrong. Even better are the one-on-one moments on deck or on shore when you can simply walk right up to them and say, "You know, I'm shooting with an ISO of 200 and an F-Stop of 11. What about you?" Many passengers come with serious, professional grade cameras and equipment, and if you want to learn to improve your skills, whether beginner or advanced, you'll find plenty of time to ask questions.