Why would you visit other hotels in addition to the one you are staying at? Because it is just different in Las Vegas, and every hotel has some unique features worth checking out: the Bellagio fountains, or Eiffel Tower at Paris hotel, or Statue of Liberty, Empire State Building and the roller coaster at New York New York. There are also seasonal exhibitions and displays updated throughout the year. For example, Bellagio's Conservatory exhibits change four times a year.
These are more than just hotels - these are huge accommodation and entertainment complexes that include world-class restaurants, shows, shopping, spas and lounges. You can easily spend a day of fun enjoying everything these places have to offer.
And it is worth touring the hotels just to get amazed by the "so Vegas" features they add to attract new customers.