Our two sailors had a keen eye for the afternoon weather. Although the gray clouds and wind seemed sketchy, they decided it was fine to proceed with our late May 3PM sailing tour on the Tagus. It was fabulous and relaxing. The big clouds ended up providing natural shade, and when a cold wind picked up, the sailors handed out blankets. We sat at the very front of the boat, which was padded; others chose seats towards the back. The sailors came around to each small group to point out significant landmarks (and provided onshore tips), but overall left us largely alone without too much commentary, which was great! They passed around cheese and meat snacks along with a free beverage (you could get more but then you'd have to pay). Notes: We used the Alcantara Mar train station to access the meeting point, which was within sight of a concession stand and a cafe.