Starting from 2011 Ecuador starts returning the tax,IVA,consumer tax, to foreign tourists
They do that to promote tourism.At Guayaquil and Quito airport they will put a box.In here you deposit a copy of your passport,a copy of the bill and your request form.Refunding starts at $50.So ask for a bill with IVA on it.Think about hotel,flight to Galapagos etc.Here is the link:
http://www.elciudadano.gob.ec/index.php?option=com_content&view=article&id=19978:ecuador-inicia-el-3-de-enero-devolucion-del-iva-a-turistas-extranjeros&catid=1:actualidad&Itemid=42