People have been recommending opening CDs (certificates of deposit) and i too would recommend this route. You should be wary, however, of the different types of CDs. I got screwed with $2000+ i had last summer because my dad, who put the money in the CD, didn't check if the "amazing return rate" compounded (which it didn't). All in all, for a year i earned only $49!

(looking back i should have just taken the money out early and taken the fee then reinvested it, oh well... my other CDs earned me nearly $1000 so i guess i didn't get killed...
MAKE SURE CDs HAVE COMPOUNDING INTEREST!!!