Right now 4% with no volatility doesn't really exist, at least for anything over 5k. If its only 5k you can look at a mangomoney savings account. However here are some options.
CDs & money markets: low returns(likely less than 1%). No volatility.
Short term bond funds: 1-2%, some volatility. A bad year might be a 5% loss.
Very conservative balanced fund. Something 80% bonds, 20% stocks. You might get 3-5% returns, BUT it will be more volatile. A bad year scenario(like 2008) might result in a 10-11% fall in value. I personally use VASIX, but there are plenty of other examples out there.