Not sure from your post whether you are looking for adult only or group activities. Purple fiddle is definately a cool place, a little out of the way on a ski weekend (however, if your lodge is North of Tline up 32 then you probably will only be 3-4 miles away. It's a bit small for a boy scout troop - but it is very family-friendly (non-smoking, board games, ice cream, plus lots of great beer). Live music is blue grass - check their website for what's going on this weekend -
http://www.purplefiddle.com/index.htmlAs mentioned above, White Grass will have live music over the weekend as well. XC skiing promises to be marginal this weekend though. Again, it's a small place, probably not more than 50 seats and usually pretty full on the weekend.
Canaan Valley State Park has tubing and airboards - no one I know has tried out air boards yet. They also have a large covered outdoor ice skating rink - open until 10 each night I believe. They have rentals and video games - plus it is usually not very crowded. Definately a good alternate activity if the skiing is beat. I have not skied there since Thanksgiving, but their trail count is not great right now, and they don't have the snow-making that Tline has.
Blackwater Falls State Park (2 miles outside of Davis) has a sledding hill and XC skiing. Again, I imagine snow cover is going to be an issue this weekend, so nothing may be happening there.
Tline itself has downhill skiing and the lodge. I would expect everything except a handful of natural snow trails to be open this weekend. Coverage was exceptional this past weekend through Monday; however, there was a bare spot starting to show on Almost Heaven. The blacks and OTW were in great shape. The Drop is probably also in great shape - though it was closed last weekend for a college ski race. They also have live music friday and saturday nights in the lodge and I have heard great food in the Timbers Pub.
Food-wise, I like Coyotes (pretty big place on 32 right near the Timberline access road). Big menu, and everything I've tried there has been pretty darn tasty. I also like Sirianis Pizza in Davis. This is a very cool little (again maybe 50 seats) restaurant in Davis. I also like the food at White Grass and the Fiddle. Big Johns, right in the Valley, seems like a pretty good place for a large group. Can't speak for the food there, but they have lots of arcade games and kids really enjoy it.
What not to do? I imagine the mountain biking would be pretty soggy this time of year!