You remember the Chronicles section of the original RotRL AP?!
There was that part, where Eando Kline went to that bloatmage...
I had my group travel to Kaer Maga, and Sheila told them, she would send one of her agents to the city, to get them the ion-stone.
What she didn't say was, that the agent had to get that stone first from a merchant (Dakar, I think that was the Name).
I played the whole part with that bloatmage and it was a lot of fun. PC helped the agent to get that stone and planned the whole Thing. I also placed some traps on the doors of the bloatmages shop.
This got us away for a whole session from dungeon crawling.