Be prepared

I loved my time in Costa Rica! It was an amazing way to immerse myself in a new culture, while helping others and building friendships. However, I would say the main thing that was a struggle for me was there was a lot I wasn't prepared for. Definitely do your research about the language, transportation, social thing, etc.
But overall, don't be afraid to jump into the deep end. This was one of the best learning experiences of my life! Happy trails :))