Don't you miss the Borderlands surrounding The Keep in B2 I think it was?
Maybe this was your first experience with an outdoor adventure as you traveled to the Caves Chaos?
Did you meet the Mad Hermit and his pet? (no spoiler)
Did you run into the Lizard-Men to the south? (I would sometimes make these guys the PC's allies if they played their cards right.)
Or perhaps you found the spider-layer? (Hobbit homage?)
This was my first outdoor area I played and DM-ed.
Later we switched to big cities like Barnacus or the metropolitan Lankmar.
What did you and your fellow player's accomplish?