Passport has to be valid for at least another 6 months
and Swiss citizens do not need a visa. A 90 day entry is standard.
Did not get checked, but I am sure that officially you
are required to have one.
The standard ownership papers are required for the various customs clearance. They ask for the Carnet de Pasage
Own license plates are sufficient.
How it went
Immigration: You have to fill out a personal information form, as well as a vehicle form, which lists how many people are in the vehicle. Both forms are taken and a entry stamp is put in the passport. Takes less than 10 minutes.
Customs: Customs requested the Carnet, and filled it in and returned it within 10 minutes. On passing the guards they asked if we had a Yellow fever vaccine, a simple yes sufficed.
Point of Exit
Colonia, Buquebus ferry to Buenos Aires
How it went
Immigration: The passport just had to be stamped out and at the same table a stamp was entered by the Argentine immigration person. So both exit and entry stamps are required before bording the Ferry.
Customs:The Carnet was stamped out at the customs building next to the ferry terminal, without incident.
Extending a Visa:
There are ATM which accept the usual cards and systems (Visa, Maestro, Cirrus, etc.) pretty much everywhere, but they tend to give very little cash. In January I was able to get 5000.00U$, around 250$ per transaction, in July the same ATM would only give me 2000.00U$ or around 100$!
There is a tourist information booths in the immigration hall.
are the details of the border crossing into this particular country.
The information is correct as of the date on which the border was
crossed. But, due to the stability and vagaries of the regimes involved,
it is prudent that you get additional data directly from the embassy
involved, preferably in your own country. Also you should keep in
mind that the procedure can vary depending on exactly who is on duty.
So never assume anything is a particular way, and regardless of what
anyone says, the impossible is often possible if you are in the right
place at the right time. Good Luck.