Do you have any debt? Paying down that money on a credit card balance at 18% is just like making an 18% risk free, tax free return. That's hard to beat.
Like the others said, your potential return will vary with the level of risk you're willing to take. For example, take the whole thing down to the casino (Wendover, Vegas) and put it all on red or black on the roulette wheel.
You have a 49% chance of breaking even, a 49% chance of doubling your money and 2% chance of losing it all. Double your money on one roll and go home. High reward = high risk.
Will you absolutely need that money in two years? Can you afford to lose any of it? If not, money markets and CDs, T-bills are the safest. You won't make anything in interest, but you're not likely to lose it all.
What risks are you willing to take? Are you fully aware of the risks out there? Examples:
1. Interest rate risk - Lock your money into a 2 year CD at 1.25%, and you run the risk of rates increasing 7 days after you get the CD. You lose potential interest.
2. Market risk - Buy a bunch of stocks or mutual funds. They can go up or down. Had your money in cattle futures two weeks ago, happy that prices were going up? Well, now you've got a problem because they went lock limit down because of Mad Cow.
3. Exchange rate risk - What good is making 5% on your money each year if the stuff you want to buy is priced in a currency that becomes 10% more expensive each year? You risk losing buying power.
4. Political risk - What if your investment falls out of favor with the gov't and is confiscated (like gold in 1932, or "blood diamonds" from Zaire)
5. Default risk - what if you don't get paid back? That 18% yield on Argentine bonds a few years ago looked pretty sweet for a few years, but now you'd be lucky to get 10 cents on the dollar for those bonds, if anything. Buy a corporate bond - the company could fold. Buy a Bank CD - it could become insolvent and you might get your money back from FDIC insurance in a couple years, or you might not.
6. Inflation risk - Is an investment paying 9% a year a good bet if inflation is 11% a year? No, because you're losing 2% a year in purchasing power.
Unfortunately, $7k really isn't that much money. You certainly couldn't justify hiring a financial planner as the fees would be prohibitive. It's not enough to diversify into meaningful positions to reduce your risk. I don't want to come across that I'm talking down to you with the above. I just don't want to see you put it all in the "stock of the month" on a hot tip you got from your girfriend's brother's roommate.
You mentioned in your post that you are "completely clueless when it comes to this kind of stuff". That said, my sincere, honest recommendation is that you put the money into an easily accessible, no fee money market account while you learn about all the various investing choices out there.
Learn how they work, what the risks are and how to play the game before risking your money. Read a bunch. Talk to those who understand, and have invested in, various areas of finance. That will be the best investment you can make for yourself.