I did the SALUD Costa Rica program the summer after my MS1. It was intensive Spanish, and we had 4 hours of Spanish class a day. The major plus was that the student to teacher ratio was 4:1, so you were forced to speak Spanish. Some days we'd have an additional lecture on healthcare related topics, or fun activities (dance lessons, cooking lessons, mini-excursions) planned by the school. A down side was that during the week, we were usually too tired after classes and homework to do much. We had weekends off to explore different areas of the country, which was great. Costa Rica's a beautiful country and I highly recommend that you stay extra after the program ends to visit the areas you weren't able to see during the 4 weeks of the SALUD program. Your Spanish definitely improves (they have all different levels) and living with a host family is great. I'd definitely recommend that you do this program during your one free summer. 🙂 If you have more specific questions, send me a PM.