I have been on very good Viator tours, but this is not one of them. First, it was indicated that there was a bus stop near the port. The bus stop was actually a long walk from the port and hard to find. Second, I paid extra for the bus plus a walking tour. When I reached the stop for the walking tour, I inquired about it. The bus representative mumbled something about "every 30 minutes" and walked away. I waited 30 minutes, and no one showed up. The same rep returned to the stop. I asked again about the walking tour, and he then said for the first time : "The walking tour is at La Lonja (Silk Exchange)". When I asked where La Lonja was, he pointed to a street and said : "Straight down that streeet". La Lonja was NOT straight down that street, and I wandered around until I finally found it. Most of the walking tour was spent inside La Lonja, where we told minute details about the building. Therefore, I lost two hours to take that worthless walking tour. Third, the audio system on the bus was terrible, and I heard only parts of the narration. Valencia is a really beautiful city, and I wish I had taken another tour, so that I could have truly enjoyed it.
If your ship docks in Cadiz, you should take a tour to Seville, which is spectacular. Cadiz is a beautiful city, but there isn't much to see. The afternoon walking tour is worthless.
Washington D.C., District of Columbia
This is a very good orientation tour. I thought we would only stop for photos, but we actually had time to visit the WWII, Jefferson, Vietnam Veterans, Lincoln, Korean and Iwo Jima Memorials. While we only toured the exteriors of the Capitol, White House and Washington Monument, our tour guide, Brian, provided interesting information at every stop. We also liked the cruise and lunch on the Potomac. We were very pleased with this tour.