I've fallen down a rabbit hole with Renown. Normally this is the time where I would start digging my way out, but it's kind of cozy down here. I think I might stay a while.
I've got a number of Factions in my upcoming campaign that the party can ally themselves with--do little favors, make some friends, that sort of thing. Complete that Bounty Quest, +1 renown with the Town Guard. Find that stolen relic, +1 renown with The Temple. As their Renown increases within these factions, other things in the game will unlock...quests will trigger, new goods and services become available, rivals will take notice.
It's either going to be a great idea, or a terrible idea.