South lake- Heavenly ski resort is Huge it covers about six mile from cali to the Nevada side, there are condo's ( the ridge is the name I think) that you can walk to the lifts. that is the main resort on south side. Sightseeing there is the lake and a short drive up the west side of Tahoe is Emerald Bay ( a must see ). If you drive to Emerald Bay you could do the hike down to the old vikingsholm house. It sit's right on the bay and is a nice hike.There are trails and beach access all along the lake and surrounding hills. The Dinner cruise of the lake is fun , not sure of the schedule this time of year. Bars and food is everywhere! along the main drag Hit Izzy's for great burgers, The brewery at southlake, or Tahoe brewing company. There are 3 casino's on the main strip and they all have good food and bars. Although Sammy Hagar's Cabo wabo is definitely a favorite.
North Lake- Squaw Valley, Alpine meadows and Northstar are the best resorts to Ski or Board. Sightseeing is a little more limited at the lake due to it being a smaller area then the south side. Donner lake and Truckee are a short drive away and Reno is about 40 minutes. I have not spent much time on the north shore so not sure enough to recommend specific bars or restaurants. The north shore is more laid back then south shore and has a more local feel. I'm sure the food and drink is good, just follow the locals. I do have a friend working a ski shop up that way I can ask about things if that will help.
Personally I think there is a lot more to do in south lake. Shows at the casino's, Buffet's, Gambling, lots of local type dive's, the old estates from the 20-30's.
I hope some of this helps, I can try to get you more detail if you need it.
Scott