About 70 percent of passengers come from Canada, with the rest split between the U.S., Australia and Britain. The average age onboard is mid-60s, and on most sailings you'll find many repeaters and a surprising number of people cruising solo. (The line prices a limited number of cabins without a single supplement.)

There are generally some family groups onboard as well, including small children or teens. Passengers are fit, well-traveled and keen to learn about the region they are visiting.

Also, due to the nature of the expedition cruises offered, Adventure Canada cannot always accommodate disabilities; interested cruisers with special needs should check with the cruise line before booking.

There's absolutely no formality onboard. As long as you're comfortable, you're good to go. The usual attire is jeans and sweatshirts or sweaters. You will, however, need to bring waterproof pants for outdoor adventures.

While daily shore adventures, some by Zodiac, are included, there are occasional extra-charge activities such as kayaking, biking, snorkeling or snowmobiling on a glacier. You'll also have to pay for drinks, including soft drinks, wine and beer; Wi-Fi; laundry services; spa treatments and gift shop purchases; and gratuities. Medical evacuation insurance is required and is at your own expense.

Sailings to the Canadian Arctic, in particular, are very much focused on wildlife, nature and local lore. Expect one or two shore trips by Zodiac each day, and accept that itineraries will be altered based on wildlife sightings (whales, polar bears), the changing weather and ice conditions.

There's also a strong emphasis on learning about local culture, history, nature, wildlife and music -- much of it thanks to the multitalented naturalists, geologists and historians onboard.

Best for: Curious, social types looking to meet and mingle with musicians, artists and naturalists, as well as fellow travelers

Not for: Travelers who want to be pampered or who are looking for big ship-style entertainment and shows