One of the things that is always a huge hit with the chapter that I help advise is a Father-Daughter Day which includes attending a college baseball game in the spring. The girls have t-shirts made up for themselves and their fathers, and the dads absolutely love it.
Last year's shirt said something like "Daddy/Daughter Day" on the front and "Diamonds are a girl's best friend" on the back with a picture of a baseball diamond. It was really cute.
Good luck with your planning!