N.B.
Get some inexpensive BIG pails/buckets at the dollar store or hardware store (all depends on what you can spend and how many Papa's you have?)
Get some dollar spot car washing doo dads..sponges and such. Have the kids do hand prints and spray with a clear coat that can be washed. Voila....car washing buckets (along with cute little coupons..maybe with the child's picture in the middle like money? for an assistant car washer?)
If they are golf or fishing fellas...gofl towels or fishing towels (to wipe off the wormy/leaches gunk)..again with hand prints? A cute saying?
I always find Dad's day way harder. Some don't have dad's in the picture....dad interests are not quite as universal (like flowers/flower pots and photo things for moms. My DC moms are more likely to work in an office to display a small photo frame on the desk than the dads are, etc).
Good luck!