i have to write a paper for my spanish class, and i have to make up a story about what i did during a church mission trip to costa rica. ive never actually been on a mission trip, so i dont know what i should be writing about. i was wondering if anyone can tell me the typical stuff that takes place during these kinds of trips

If I were you, I would look up organizations that provide mission trips to Costa Rica and find what they say it involves.

Missionaries clean up, build/rebuild, deliver goods (food, clothing, etc.), teach (hygiene, how to clean water, how to grow food, etc.). There are some medical missions trips where immunizations are administered, injuries and illnesses are tended to, surgeries are performed, etc.

The missionarires are not always "at work", though. They do some tourist-y stuff as well, so perhaps look in a travel book to find something like that to base your story around. They interact with the people a lot, hearing their stories. They eat the food, learn about the culture, etc.