I've found that this kind of father's day gift is best. I've been doing the labor kind of gifts for a few years now. I took my dad's boat which hasn't seen a body of water in 7 years or so, and took it to work last night and took the steam cleaner and blasted all the mold off of it inside and out.... 7 hrs with the steam cleaner, 5 of them inside. Yeah, it was a bit warm in there... then I fixed the lights on the trailer, took it for a high speed blast down the freeway, and put it back in the driveway before he got home from work.
You did an awsome thing, and now you two get to share the hobby some more.
Happy fathers day to you, my son is getting ready to take me to go see the movie cars.