Gifts and date ideas for three year anniversary?

We have been dating for three years, were both 18 and just graduated so were living at home, I dont have a ton of money but I really want to get him something special. Its still a little less then two months away, so I still have time to order stuff online. Ive already got us tickets to a football game and I got him an engraved flask, but I need something else to make it complete. We both also have no idea what to do for our anniversary, so any nice romantic ideas would be greatly appreciated!