Citizens of up to 93 states including all European Union citizens and US citizens don't require visas if they are visiting for a period of less than 90 days. If you're not sure whether you need a visa or not forward your inquiries to the Chilean immigration office.
South American nationals can enter Chile using their national IDs, for other regions you must have a valid passport. If you're visa exempted you'll be given a tourist card that gives you a maximum of 90 days stay upon entry, be sure to keep it well since they'll want it back at the time of departure.
Parents traveling with minors have to prove that they are related to the child by presenting the child's original birth certificate.
No currency restrictions
Chile, however, has strict restrictions on agricultural products. You have to declare all plant and animal products that you've carried at the time of entry. You'll be given a declaration form to fill upon entry and you have to state all agricultural products you've carried failure to which attracts a fine.