Colonia del Sacramento is a beautiful little town, lying just across the Rio Plata from Buenos Aires. It’s in Uruguay, so you will need your passport.
Ferry services are provided by Buquebus, they offer fast and slow services; take the fast service 1 hour service, its not a particularly interesting journey and you can save 2 hours over the slow ferry. (cost AR$300 return), the service is efficient with airline style check in and security.
From the port you can walk to the Barrio Historico in a few minutes, just turn down Calle Florida, first left when you leave the port gates. You don’t really need any transport, but it is possble to hire golf buggy type carts if you can’t be bothered to walk. Traffic is light to non existant in the old town (and even bits of the new, this place is very relaxed) so walking is what Colonia is all about; the town is just picture perfect and has lots of cafes to sit for a while. Clearly its all very geared for tourists, but despite the fact the ferry was full, the town was not crowded at all, this was a Fiday, it may be different on weekends.
There are 7 key sights/ visiting spots, and a joint ticket gets you in to all of them; interesting but not essential, the joy of the place is just to wander about. The whole Barrio Historico is UNESCO World Heritage listed and as a consequence is well looked after and almost completely free of advertising tat and other modern distractions (in fact the only modern adverts are on cafe sun shades).
Lots of places to eat all over town; take your pick from people watching on one of the squares or a view out to sea, from what I saw most places looked adequate and reasonable value (especially given the location), if not ‘special’ in terms of food offerings – lots of grilled meat/ fish, with salad etc…
The old cars are something of a feature in Colonia, more photos here on the original post
You can stay over here as well and it is certainly something that I would consider on future visits; it is very calming being here for a few hours and a welcome break from some of the more frenetic stuff on the other side of the Rio Plata. Rates are good midweek when things are quieter; some recommendations on the Colonia website: