Tip –- If taking the train from Villazón up to Tupiza or Uyuni then buy some coca leaves before boarding. These will help with the altitude gain.
Tip: If the time is 3am in Argentina and Brazil, it’s 2am in Bolivia and Chile, and 1am in Peru, Ecuador and Colombia. (GMT: 6am)
Tip — Border towns will often be the cheapest places to buy stuff (woolly jumpers, electronic goods, etc.)
Tip — on an international bus trip that crosses various countries don’t exchange money until you reach your destination country. The restaurants where you stop off in the intermediate country(ies) will accept your foreign money.