New version uploaded to address some issues raised in this thread
Fixed the note on the 'Key Bits' so it now says Keebo instead of just XX (that was a temp fill until I looked up his name and I clearly forgot to go back), I've plugged several holes in the border but if I've missed any please let me know.
I just threw the Lower Yoma switch - the one under the trees at the bottom. Don't know what this changes - am reexploring again.
Oddness, I think that must have ended up there by accident as I certainly can't think of a switch playing any part in anything though I couldn't actually find were this is to check.
For the Lower Yoma Valley key, I presume the bucket of "nice cold water" is to quench the fire in the stove and get the key (the "glint of metal") out, but I can't pick it up. I've left-clicked, right-clicked, clicked on the rocks beside it (and quenched my thirst) and stared really hard at it for a bit, and nothing doing.
That bucket will play a part after you have the key from the stove, you will need to find something else on that map to help you retrieve it first though, I've made an adjustment to the tree line in the new version that should make that item a bit easier to find.