Option A: Take shuttle and leave in the morning for skiing/boarding/tubing (bring packed lunch with you)
Option B: Take shuttle and leave after lunch for afternoon (half day) skiing/boarding/tubing
Option C: Stay at the Lodge. Free skating nearby, pool/games room, hang out/free time etc.
(There is freedom to change this, but this is just to give us an idea of how to provide adult supervision and groups etc. for the Saturday depending on what people want to do.)