Hey heathpack, we traded into Hyatt Sedona and are here this week, maybe got your unit, ha. Great to be here again as always.
Since you mentioned David Walleys - I know that you are familiar with the mountain bike trails around Lake Tahoe itself. In case you hadn't seen these others yet though, there are also some nice trails on the east side of the mountains in the Carson Valley area by Genoa, especially the Clear Creek Trail and Genoa trail system. Maybe hotter if you're going in summer, but we hike them even in dry/warm winter years, and see bikers especially on the Clear Creek trail.
So, in case you didn't know about these yet, or if you do and it might be news for other readers here, here's the link to their trails:
carsonvalleytrails.org