Speaking of @bigzaphod -- you might not know this about him, but he's a great table-top campaign idea generator. Basically our system is: he gives me an idea seed (possibly partially fleshed out, partially not) and I turn it into a campaign and DM for the kids.
Yesterday the boys groaned with laughter when they realized the quest was a scavenger hunt. They had a blast finding and collecting "treasures" (trash) for the tiny (HUGE), cute (MAGNIFICENT) dragon Jeff who really just wanted friends. 😂