Question regarding the touristic visa
Visas: Nationals of Canada, most Western European countries, Australia and New Zealand do not need a visa to visit Argentina. Upon arrival, most visitors get a 90-day stamp in their passport.

People from countries on the list below can stay in Argentina until 90 days:
Andorra, Armenia, Australia, Austria, Barbados, Belarus, Belgium, Bolivia, Brazil, Bulgaria, Canada, Colombia, Costa Rica, Croatia, Czech Republic, Chile, Cyprus, Denmark, Ecuador, El Salvador, Estonia, Estado Ciudad del Vaticano, Finland, France, Georgia, Germany, Greece, Guatemala, Guyana, Haiti, Honduras, Hong Kong (With Passport R.A.E.H.K.), Hungary, Ireland, Iceland, Israel, Italy, Japan, Korea Republic, Latvia, Liechtenstein, Lithuania, Luxembourg, Macedonia, Malta, Mexico, Monaco, Montenegro, Nicaragua, Norway, New Zealand, Netherlands, Panama, Paraguay, Peru, Poland, Portugal, Romania, Russian Federation, Saint Kitts and Nevis, San Marino, Santa Lucia, Saint Vincent and The Grenadines, Serbia, Singapore, Slovak Republic, Slovenia, South Africa, Spain, Sweden, Suriname; Switzerland, Thailand, Trinidad and Tobago, Turkey, Ukraine, United Arab Emirates, United Kingdom Of Great Britain and Northern Ireland, United States of America, Uruguay.

People from list below are allowed to stay until 30 days:Grenada; Hong Kong (With British Passport B.N.O.); Jamaica; Republic of Kazakhstan and Malaysia.
Depending on your nationality, very short visits to neighboring countries sometimes do not require visas. For instance, you might not be asked for a Brazilian visa to cross from the Argentine town of Puerto Iguazú to Foz do Iguaçu, as long as you return the same day but doing so is at your own risk.

Visa Extensions: For a 90-day extension on your tourist visa, get ready for bureaucracy and visit Buenos Aires’ immigration office Dirección Nacional de Migraciones (www.migraciones.gov.ar). The fee is currently AR$2700 for non-Mercosur nationals (those from countries other than Argentina, Brazil, Paraguay and Uruguay). For MERCOSUR countries, the fee is AR$900. Another option if you’re staying more than three months is to cross into Colonia or Montevideo (both in Uruguay; Colonia can be an easy day trip) or into Chile for a day or two before your visa expires, then return with a new 90-day visa. However, this only works if you don’t need a visa to enter the other country.