It's never too early to plan for dad's big day. You can do something sentimental by giving your dad a custom-made gift that he will always remember. For instance, CafePress has a ton of different designs of t-shirts and other products for dad such as "Grateful Dad," "You Can't Scare Me - I Have a Daughter!," and the timeless "World's Greatest Dad." Many department stores now offer the ability to personalize gifts such as coffee cups, shirts, sweaters, blankets, hats, towels, and more. If he likes puzzles there are services online that will make one from any photo you upload to them. These personal touches will show dad what he means to you.