Scout's two main jobs are bringing in the mail and the lighter bags of groceries.
She has a pretty strong retrieving instinct so a lot of our games build off that. On walks, I'll have her carry her leash in her mouth or sometimes she'll grab a toy to carry instead. She seems to knows the names of some of her toys, so I can send her off to find, for example, her elephant and off she'll go furiously searching for it. If she brings me something else I just keep sending her until she brings the right thing; this game is at least somewhat conducive to my attention being elsewhere. When she inevitably has toys strewn about the house or the backyard we can play clean-up by just continually sending her back and forth to retrieve everything. You could definitely train him to drop the toys in a basket to make it more of an independent activity. In fact, adding more rules to games you already play is a great way to get more value out of your time. With fetch, have him wait until released to get the toy after it's thrown. Always make him bring it to hand and so on.
If she's really hyped up, I'll have her stay out of sight and put out a bunch of treats or other food items hidden around a room at varying heights
and then release her to find them. That'll hold her focus for quite a while and I make sure to check up later and tell her "all done" or she'd probably search forever.
And lastly, don't underestimate the value of a good chew. I like raw beef ribs and can usually get 1-2 hours of peace from one, but use whatever long-lasting chew toy you're comfortable with.