I grew up in the country and don't recall being bored for very long. Usually right up until my mom offered to give me something to do.
we had a place on 4 acres in michigan when our oldest
(now 17) was 4 or 5. he was up with the birds and stayed
outside ALL day! that child plucked tomatos and beans from
my garden when he was hungry. he, er, didn't even come in
to use the, er, facilities ;)
we still laugh about it, and he laughs the loudest!
Let's see....
it usually went: "You're not sitting around watching TV all day" followed by "Find something to do or I'll find something for you."