Notebook, pen, pencil Dictionary (small) Extra bag or space to bring shopping items. Electric current in CR is the same as in the USA. Costa Rican weather is mild and close to the 70s. We suggest that women avoid wearing short skirts.
A present for the host family such as candy or a product from your home region (this is optional) Pictures of your own family, pets, neighbourhood, school, etc. Anything you will need while here since sending packages to Costa Rica through the mail is not recommended. It takes a long time to clear customs and taxes are expensive.
Most important of all, bring your sense of humor and an open mind!!!!