Silversea’s Silver Explorer, a 132-passenger vessel, was the first ship to incorporate luxury into expedition cruising. The cabins are all suites ranging from 180 to 600 square feet. And they all have views of the water, from two portholes up to a private veranda. It’s an all-inclusive ship, so beverages (including alcohol), gratuities, and specialty dining are included in the fare. So are shore excursions, snorkel equipment for warm-weather destinations, and expedition gear for cold-weather locales.