If your staying at the lodge I would try the mouth of Horseshoe Creek. It is about 1km East of the lodge, just follow the North shoreline. I have never ice fished there but there are lots of big pike there in the summer. There is a shallow flat that extends out into the lake fairly far. There also has to be some walleye around there somewhere as most of them would likely leave the Umpherville R in search of a winter resting ground (no one likes current in the winter).
Word is that guys are driving across from the post to barge landing (there was between 16 and 22" of ice at a few places that I checked on hidden bay on Dec 1 so there should be lots now). You could drive on there and access the whole lake. Just be cautious of creeks and what not.
