I do this trip every year and it's the best time to be in Vegas if you're a huge sports fan. Two weeks before the Super Bowl is the divisional playoffs. That means there are two NFL playoff games on Saturday and two on Sunday.
Most people want to go on the Superbowl, but with only one game it actually gets a little boring. With 4 games on the weekend there's tons of great betting and the games are usually fun to watch. I usually go with 4 or 5 guys and people stay at the Bellagio or The Wynn. I prefer Bally's for the value.