What should I get for Father's Day?

My dad is the hardest person in the WORLD to shop for. He doesn't like sweets, he eats bran and trail mix stuff, picky with ties (already has 20 or so), he has about 50 small knives and asks for one every holiday and each time I have never seen the knife again. He likes tools but has a LOT. I do origami and have made him cranes, stars, flower bouquets, etc. I've tried making crafts but that doesn't work. He likes books and he has an iPad and uses the kindle but I got him an Amazon gift card for his b-day which was 2 weeks ago and he hasn't used it. I don't have a lot to spend because I'm only 15 and I love making things but he is honestly so picky and its pointless to get him anything because he never uses anything. I could get him shirts but then again he only buys from L.L. Bean and I can't really afford that. I could take him out to lunch? But that's not very fun I guess.....Any ideas? I'm really at a loss.....