Learning/retaining Spanish

[emon87]

I took Spanish for the past two years in school because I needed to in order to graduate. I hated it and didn't really want to be in the classes, but nevertheless I got good grades and tried decently hard because I didn't want it to mess up my GPA.

Anyway, I now have a two year background in Spanish and I've decided that I want to try and learn more/retain what I have in case it can help me later in life. Also, so that the roughly 15k I paid for all those classes doesn't go to waste.

How can I go about it? I don't really want to take any more Spanish classes, although I might take one or two.