Gosh, I really could not disagree more. I think Colonia is well worth a night and maybe even two. On summer weekends the town is a destination for sailboats coming across from Buenos Aires. Quite a fun atmosphere. The old town is quite nice with a few galleries and other interesting shops. While I agree that the town can be seen in a few hours, I think it's a great place to catch your breath for a day in incredibly pleasant surroundings. Don't miss the sunsets over the Rio.

Call me crazy, but I like Montevideo. First, it has a faded glory atmosphere about it that I find interesting. Second, you absolutely have to do lunch at the customs house at the old port. Incredible parilla, in my opinion, better than what I had in all of Argentina. Third, wait until you taste the ice cream in this city. BsAs has its share of very good ice cream outlets, but Montevideo is the ne plus ultra. Incredible. Last, there are a number of excellent restaurants in the city.

I was in Punta during the high season last January for a weekend. Very crazy then. Although crowded, we're not talking the Hamptons here. I'd recommend it for the people watching and a bit of beach fun.