Thanks so much for your reply!  I accidentally deleted my savefile, though, or maybe the update made it incompatible, but it shouldn't take too long to rescan the stuff I know how to reach.  

I never thought of using

Kaakana

to reach a non-adjacent room (and the two Mt. Sus rooms that are connected to 

3.5

aren't useful for getting to the main body of the mountain (i.e. where all the clouds are, and the top of the waterfall you see when double jumping up from 3.8).  That said, the party house redesign seems to have

added an exit that makes double jumping off the bear unnecessary, so  we will se where that giant new area leads, maybe there's a way up from there.I will see where that goes