I have stayed at TI, Tropicana, MGM, and my wife's favorite, Monte Carlo. Thier our lots of free things to do like the show in front of TI, along with just visiting the various hotels for fun. You could take one night and go up to fremont street which is the original "strip" They have covered the street with a roof they put laser shows on.
If you like magic, go see Lance Burton at the Monte Carlo.
If you are a rookie gambler, most of the major hotels have table game lessons in the morning. Its free. The San Remo (across from MGM and next to the Tropicana) has 2 dollar minimum tables.