There are many sites to see just by wandering up and down the strip.
We recommend:
Take a ride on a gondola at the Venetian
See the Luxor - in the shape of a huge pyramid
The night time fountain show at the Bellagio
Getting off the strip, you are only a short distance away from the Grand Canyon. If you have had a big win, try a helicopter flight! If not, there are coaches or you could even hire a sports car for the day.