In which case, maybe check out "The Stygian Library" as well? Both of them are easy to drop into anything, but maybe a little too procedural. More interludes than destinations?
If you're happy with your campaign world then Planescape is right out, since that's an entirely different millieu, but you can run "The Final Boundary"
...DCO (plus it's desperately bleak). One hell of a good read though.
It got slapped down by this site's erstwhile host (much to my disappointment), possibly due to it being a 3e product, but "Vault of Larin Karr" had lots of slice o' life wilderness adventure to drop into a campaign as well.
And yeah, Castle Xyntillan is an absolute gem!