I went to the craft store and found a frame with three photo openings in it, a 5x7 in the middle and 4x6 on the sides.
I put a picture of my daughter in the middle and used a black ink pad and put her handprints in the two pictures on the sides. Then across the top of the matte I put the words "I love you this much!" He LOVED it.
I also went to the bookstore and bought him a daddy-themed story book. He loves ready stories at bedtime to my daughter and she loves to read with him. I decided to make it a tradition to get a new book for him to read to our kids every year. The one I bought last year was "Daddy Hug" and it is SO cute and my daughter loves it. She requests it all the time.
Any local bookstore will likely have a father's day selection pulled so you'll have lots to choose from and browse, if you're not sure what you're looking for.
Have fun!