Hi Julie,
Here is an idea that I actaully copied (shh) from big companies selling gift baskets.
Fill a basket (I was thinking of using a patriotic themed basket so I could re-use it) or a themed can or other container, tackel box, tool box, planter, whatever - with favorite goodies such as beef jerky, m&m's, rootbeer, granola bars, lottery tickets, etc. The ideas are endless, just think about dad's favorite's.
Best wishes. I hope these idea's are helpful and I also hope you have a great time filling containers!
lawnangel, aka, Debbie