Aside from dollar value information, which depends on your country of residence, the same rules apply to everyone. You can not bring cultural artifacts, animal products, including coral, bones, live or stuffed animals, etc. For current information, be sure to check with the Ecuadorian customs office. It is a serious offense to attempt to export a restricted item.
U.S. Customs allow for $800 worth of duty free goods per person, every 30 days. Included in this can be up to 2 liters of alcohol. For detailed and current rules, please visit U.S. Customs and Border Protection.
Canadian Customs allow $500 worth of duty free goods per person, after a seven day trip out of Canada. You may include 40 oz. of wine or liquor or 24 12-oz containers of beer or ale. For detailed and current rules, please visit Canada Customs and Revenue Agency.
For New Zealand travel and customs information, please contact Customs Service.
Residents of United Kingdom can receive specific information from HM Customs & Excise.