Save Uncle Crimbo!
Upon getting the quest, it seems the next time you use your Cottege/House, you'll be visited by a Ghost. Not THE Ghost, but he'll tell you that you're going to be visited by three ghosts. Ghost of Crimbo from the way-way-past, a Ghost of Crimbo Right-about-now, and a Ghost of Crimbo of the Not-Too-Distant-Future.
The next time you use your Cottege/House - the Ghost tells you about Crimbo Rock, and that you'll have to search for three items to get Uncle Crimbo to remember.
Re-visiting the Mountains will now have Crimbo Rock.
You'll need to adventure in the 'Simple Tool-Making Cave' until an elf drops a Big leaf, and keep going until you also get some string, and a few sticks. When you visit Ugh, one of the options will be a 'Rolled Leaf' - grab that, and make some 'Fire' while you're at it.
Combining the two give you a 'Lit Cigar' - and when used, shows that you're on the 'Right Track' (?) in finding Uncle Crimbo.
In your quest log it'll read:
"You've found Uncle Crimbo, but he doesn't seem to want to leave. You're going to have to try to find the two other things that he likes to convince him to come back."
Next... ?