I already took 3 yrs of Spanish at my high school and I want to go to Harvard. What should i do?

I've taken the highest Spanish course offered at my high school (AP Spanish Literature). Freshman year I took 1 semester of Spanish 2, then skipped to Spanish 3H for 2nd semester, Sophomore year i took Spanish 4H, and then junior year I took AP Spanish Literature (skipping AP Spanish Language). I know that most colleges want 4 years of a foreign language (I would imagine Harvard more than the rest). What should I do? Should I take another course at a local community college, teach an ESL class, etc? Any ideas? Thanks!