Dare I say this?
Rather than blaming “Kids these days” could this be a lack of parental imagination?
I know it’s easy enough to plonk them in front of some internet-enabled device and let that entertain them for a bit, we’ve all done it,
But, given your circumstances, if you want your kid to go out and do stuff and there’s no other kids for them to hang about with, you are going to have to come up with some activities to do with him yourself.
It doesn’t have to involve travelling miles or anything particularly complicated, got a park nearby? or a Garden, have a kick about, fly a kite, ride a bike…
If you have to work, especially if the weather’s shite, leave him a bit a of a project to do while you are out, get him an airfix kit to assemble or a model castle kit and you help him paint it later…
You really want him to be keen and excited waiting for you to come home and show him stuff, but it doesn’t just magically happen, you have to provide a bit of positive input…
What’s sort of stuff is he into? try and find some activities that can cross over with his interests, however tenuous the link might seem…
The last thing you want is for your son to associate visiting his Dad with simply being bored… That way lies future resentment and hostility…