When you look at this tour description you think you are getting a guided tour of Colonia del Sacramento when all this you are getting is a round trip ticket on the ferry Buenos Aires-Colonia. Be aware that your confirmation is not a ticket, you must arrive 1.5 hours at ferry station before departure. When we arrived in Colonia there is no person to give you tour, you have to find all the information on your own. Luckily for us we went to Information desk and with our limited Spanish and his limited English we found where to get a guide from a local. You will be charged about $40US for a guide, but know that they only take Uruguary Pesos not $US. Tour is only of old town not other things in Colonia. If we went again, obviously we would not recommend Viator, but we would recommend you stay over one night in Colonia. I want my money back!!!!!!
Please find below a link to product description. You will see that there is no guided tour detailed.
Also we sent you a confirmation message 24 hs before departure where you can check again the details on the journey that you booked.
We are very sorry for your misunderstanding.
If you have any other doubt please do not hesitate to write us.