Currently, there are more than 20 ships operating Douro River Cruises, and that number is growing. See our story, Six Reasons Why You Should Do A Douro River Cruise Now. No wonder the Douro’s popularity is soaring. The Douro is a great destination for those wanting to explore Portugal’s natural beauty, its delectable food and wine, and the country’s warm and friendly people.For a taste of how Emerald Cruises serves up Douro River Cruises, check out the video above and my post, Douro River Cruises: Six Reasons To Choose Emerald Cruises.