You won't see much in 2 days. It could take you 2 days to get out of the MGM Grand Hotel! Only joking!
I'd just see some of the hotels. You won't manage them all so stick with may be The Ventiain, MGM, Ceasars and may be one or two others.
The fountains at the Bellagio in the evening are lovely. The Ventiain gondola rides are a big cheesy but fun. Shopping is great.
To be honest. With 2 days I wouldn't plan much. I'd just get up, go for a wander and see where it takes you. I think if you plan to much for two days you will be disappointed as you probably won't get to do it all.
We plan to go an a trip to the Grand Canyon which leaves 2 days to see the sights. Staying at the MGM grand, thanks to advice on another thread, so what do we need to see? Or more importantly, where don't we want to go?