Hotels are nice..,
Bellagio fountain show.. there are scheduling.. In summer may be 15 mins, other times may be 45 mins interval not sure though
Shows
There is a volcano show as well near Treasure Island
Old Fremont Street.. Where you can see worlds largest LED screen.. Think about Pardes, the hindi movie.. LOL.. Zip line.. that's not the big one but still you can enjoy..
There is the inner waterslide inside hotel i heard in old downtown.. that will be fun..
Ofcourse Strip Clubs
You can go to Hoover Damn as well
Plenty of nice foods.
Now i heard there is the thing called LINQ which is just like London Eye which is just added.. You can enjoy that too
Shopping outlets which are nice
Roller Coster ride inside hotel
But you will enjoy if you stay there for 3 days Max.. Over 3 days you will get bored..