I'll be going back to school next fall (I'm 28) and will have to complete the foreign language requirement. I took two or three semesters of Latin my first time in college, but it's been so many years that I can't just start where I left off. I've been thinking about starting over in another language, maybe Chinese or Russian.
If you took some Latin continue with Spanish. Spanish like French or Italian is a dialect of Latin. Will be quite useful for a long time (few hundred million Latinos are not going away soon). It is relatively easy to learn.