Mistpeak Valley and Chillbreath Caverns

Mistpeak Valley and Chillbreath Caverns collectibles:
3 Silver Keys
1 Gold Key
5 Garden Gnomes
3 Brightwall Books

(Note that one of the silver keys listed by the game as being in Mistpeak Valley can only be reached from Millfields, via the entrance to the Mistpeak to Millfields Monorail station there, and is not directly accessible from Mistpeak Valley itself.)