Does he enjoy any sports? Golf, for instance? You could buy him a
round of golf. You can find inexpensive course.
Did he grow up in the area? How about taking a picture of his old childhood house?
Does he bbq? How about new bbq tools?
Tickets to a sporting event but only if he would enjoy it.
Think....what ARE his interests? He has to have something, I would hope. Does he read, play video games, like to sit outside? What is he into? Then go that route.
Does he have an easy chair to sit in in the living room?
Magazine subscription?
Kindle?
I know you say he's not into food but how about a fave snack?
Lawn chair if he sits outside.
Btw, enjoy your 40th & treat yourself making YOUR day special! :) A birthday is special. Every year we get older means another year we are alive & healthy! It should have nothing to do w/Father's Day. They get that every year too.