Travel Avoid the crowds: Cruising Portugal’s Douro Valley is a tranquil way to explore a historic wine region September 9, 2021 Dan Fellner Comments Off on Avoid the crowds: Cruising Portugal’s Douro Valley is a tranquil way to explore a historic wine region Cruising the Douro River in Portugal is a tranquil way to explore the country's history, winemaking and culture. Here's what to expect.