We loved our trip to Colonia, Uruguay with Mercedes! She organized the entire visit so we had no stress over getting the tickets (she handled), crossing the border both directions and getting through customs (she gave us detailed instructions and walked us through), etc. Colonia was fascinating and this was a very educational trip for our entire family group (four young adults ages 18-22 and two adults ages 52 and 54). Mercedes has tremendous knowledge about the history and culture of the entire area (Argentina, Uruguay, Brazil, the influence of the Spanish, Portuguese and English and related matters) and all of us learned a tremendous amount. She is a patient and excellent teacher. We also had a very nice lunch with her at a local restaurant, got to meet some local dogs and cats (the kids loved it) and had a nice walk through the city, the old fortifications, and the waterfront. This day trip was one of the highlights of our Buenos Aires vacation (first visit for all of us to Argentina) and also was a nice break from the hustle and bustle of the city - no hustle and bustle in Colonia! Highly recommended!