Sail ship cruises offer a unique type of cruise. Most cruises operate with a big noisy engines that propels the cruise liner all around the world, no matter the weather conditions. Sail ship cruises, at least the biggest ones around, operate thanks to the wind and many giant sails (and a few engines when the conditions aren't right). These sail ships do have a captain, a first mate, and all the usual people who are required in order to make a boat sail through the seas safely.
However, on sail ship cruises, like the ones with Windstar Cruises, it's most efficient to use a computer to actually do the sailing. The computer can then consider the direction of the wind, and move the sail automatically with things like electric pulleys in order to change the directions of the sail and to move with the wind in order to get pull, pulling around "the world's largest sailing yacht." On sail ship cruises, since the boats are smaller, you should note that you'll be able to really get to know everyone on board. On the bigger cruise ships, most days you won't hardly recognize anyone around the boat except perhaps the people in the neighbouring cabins after all, with thousands of people on each mega cruise ship they will almost all be strangers.
On the sail ship cruises however, especially on Windstar Cruises, there will be between 148 and 312 passengers. You'll quickly get to know most of the passengers quickly as you'll see them all around the boat. It makes sense that the boats can only have this many people since the sails cannot achieve enough pull to drag a huge boat around. It's also a much more elegant way of travelling.
Rather than pulling into port in a floating city that pollutes the harbour (with sewage, and such a huge number of tourists getting off), sail ship cruises attract a lot of attention, but more admiration than disdain. Sail ship cruises you see are the green way to take a cruise. And with more and more people eager to reduce their carbon footprint it could be a real grower in the future when people try to show off how green they are on their holidays too. There are of course engines too and one of them is electric. This could surely be increased with the use of solar power perhaps to a time one day when the vessels is almost completely carbon neutral. That would be a good direction for cruising to take.