Unless you can bring between the balance that is owed the bank and what you can sell it for to the bank, your options are to do a short sale or a deed in lieu (provided the bank will let you) or let it go into foreclosure if you are trying to move. All of these options (other than bringing the difference to the closing table) will affect your credit. If you don't need to move, then your best option may be to sit tight and wait but it will be several years before the market is expected to be back to where it was (and no one has a crystal ball to tell you if that will be in 5 years, 10 years or longer). Renting is an option that some people are exploring as well.
You can work with an investment company that buys the home from you, but that still affects your credit and is essentially a short sale
Please let me know if I can provide any other assistance