During a beautiful summer day, I almost went for a cruise on the River Douro (Douro in Portuguese) and the output is the made from the lovely town of Peso da Regua on a boat of these that make the crossing for 50 minutes, but offered services of a full day or even a week with boats of all kinds, depends on the duration of the voyage. Going down to the "Cais do Douro" I noticed a very long cruise with many cabins and restaurant. I was curious about it, so I asked if we would be going towards it. Really looked like a big floating hotel. As we did not have much time do we settle for almost an hour watching the spectacular landscape of vineyards, noting that the river water sometimes blue and others returned as green as the color of the vines on the hills and quiet breathing.