Customs vary slightly from country to country, but you can generally bring in personal belongings, camera gear, laptops, handheld devices and other travel-related gear. All countries prohibit the export (just as home countries prohibit the import) of archaeological items and goods made from rare or endangered animals. Avoid carrying plants, seeds, fruits and fresh meat products across borders.
There are few trains, although scenic lines operate in Argentina, Bolivia, Brazil, Ecuador and Peru.
Onward or Return Tickets
Some countries require you to have a ticket out of their country before they will admit you at the border, grant you a visa or let you board their national airline. The onward or return ticket requirement can be a major nuisance for travelers who want to fly into one country and travel overland through others. Officially, Peru, Colombia, Ecuador, Venezuela, Bolivia, Brazil, Suriname and French Guiana demand onward tickets, but only sporadically enforce it. Still, if you arrive in one of the countries technically requiring an onward ticket or sufficient funds and a border guard is so inclined, he or she can enforce these rules (yet another reason to be courteous and neatly dressed at border crossings).
While proof of onward or return tickets is rarely asked for by South American border officials, airline officials, especially in the US, sometimes refuse boarding passengers with one-way tickets who cannot show proof of onward or return travel or proof of citizenship (or residency) in the destination country. One way around this is to purchase a cheap, fully refundable ticket out of the country and cash it in after your arrival. The downside is that the refund can take up to three months. Before purchasing the ticket, you should also ask specifically where you can get a refund, as some airlines will only refund tickets at the office of purchase or at their head office.
Any ticket out of South America plus sufficient funds are usually an adequate substitute for an onward ticket. Having a major credit card or two may help.
Sufficient funds are often technically required but rarely asked for. Immigration officials may ask (verbally or on the application form) about your financial resources. If you lack 'sufficient funds' for your proposed visit, officials may limit the length of your stay, but once you are in the country, you can usually extend your visa by producing a credit card or two.