You could put it in a CD. I actually just switched from my horrible bank's money market account to an American Express CD. They have several options for CDs (6 months, 12 months, 18 months, etc..) but with CD's you can't withdraw any money without an outrageous penalty. But the APY on the account is 1.25% (for the 24 month) which is infinitely better than the rate I was getting with the money market.

It's not a "retirement" option, but you get much better interest with a CD. You just need to be sure that you wont need to dip into that money for X-period of time.