Walk around in as many of the "hotels" as you can. They are entertainment in themselves. eg, Some have shopping arcades like little villages - & the Venetian simulates Venice, the Rialto Bridge, Gondalas et al! Including a sky-painted roof so you feel you are strolling around outside, rather than inside a building!
One of the hotels (I forget which - sorry!) has a fountain that "comes to life" every hour and acts out a battle of Fire Vs Water with special effects - very impressive in the over-the -top mind-blowing way that only the U.S. can provide!!
For views of the strip, you should go go up the Eiffel Tower - yes they have built their own!, and also the Statosphere Tower. No this is really impressive - the panarama from up there is breath-taking. Plus if you-re really brave, there is one of those gravity drop rides, and a roller-coaster around the outside of the spire at the very top... There is also a roller coaster all aroun the New York New York Hotel.
Lastly, I would say have a look at the dancing fountains outside the Bellagio Hotel, the white tiger, and lion enclosure, just inside the MGM, and Luxor - the huge Pyramid shaped hotel with its slanting lifts, and pyramid simulator ride.