Wanted to learn about Portugal and the port wine region of the Duoro Valley. Lisbon extension with included excursions and side trip to Salamanca, Spain were added bonuses. Great weather did not hurt. Day time cruising on the Duoro, because river boats can not travel at night, gave us lots of sightseeing opportunities on this beautiful river. Fantastic locks and excellent included excursions along the way. Splurged for the dinner at Graham's Vinum restaurant and was not disappointed. Thoroughly enjoyed the smaller ship. Viking always does an excellent job. The way they helped a man who was injured on one of the excursions was noteworthy. A security/translator and medical staff member went with the man and his wife to seek medical treatment and rejoined the boat later in the day. They even allowed them to stay an extra night on the boat to recuperate prior to leaving for home. When we were ready to leave on an earlier bus to the airport, Viking recommended that we relax in the lounge so we did not have to spend so much time at the airport. They then took just the two of us in a bus to the airport. The only negative was that the hotel was having an extremely noisy function until 2:00am on the night before embarkation - no sleep and no help from hotel staff in spite of calling the front desk multiple times - we were in an inside room overlooking the lobby/ballroom area.