Maximizing Fund Opportunity

I have yet to do any investing outside of retirement and savings. I am interested in the board's opinion on managing foreseeable upcoming expenses. I am primarily looking for ways to maximize my money's growth with low risk before it is time for the expenses. Obviously savings is low risk, but minimal growth.

My goal in this is say, I have a $5000 expense that I am very much aware of in 2014, what are some suggestions to max out any return on $5000 I have now going into 2013 that won't hurt me when I need to pay it in 2014?

I don't have a specific $5000 purchase, although I can certainly list off several expenses I am planning for such as roth ira, membership fees, vacation, etc... I have money now that I can use to pay for my 2013 expenses, except barring some unforeseen salary reduction, I should be able to save up a similar amount again in 2013 that I could use to handle 2013 expenses, while my other money builds towards 2014.

//If this needs further clarification I will do my best. I want maximum opportunity out of $5000 within the time allotted.