there is a bunch of stuff (other than the obvious) that you can do
off the top of my head
go to the stratosphere and ride the attractions at the top of the tower, I did the 'big shot' ........except for the bungee jumping I did this year...that comes second in term of getting close to crap my pants
there are very cool 'star trek' attractions at the Hilton (off the strip) , if you like sci-fi its a must do
you can do a quick trip to the Hoover Dam , its about 1 hour max (I dont recall how long it took me to drive up there)
there are many shows going on (the beatles one sounds interesting, I havent seen that one)
roller coaster rides at the New York - New York hotel and also at another one that I dont recall what it was but its down the strip (towards downtown and way before the stratosphere)
enjoy the freebies (fountain show at the bellagio and the volcano stuff at the mirage I think it was?)