I agree with Chris-diversify. Don't try to grow your money quickly-as it is more risky and you could lose it. If interest rates were lower, I'd say look at some turnkey, long term rentals. With the current interest rates (which are pretty average) and house prices, I'd look at high yield savings accounts.
you don't mention if you own or rent your home. If you rent, look at buying a duplex where you can live on one side and rent the other, but run the numbers to see how that compares to your current living situation. Also think long term-when you are 65 and possibly retired, do you want to still be paying rent or live in a house with no mortgage?