I have been to Vegas over 30 times in my life and the Four Seasons is the only place I will stay.
The hotel is non-gaming which means you do not have to schlep your luggage around a casino. Also, there are fewer rooms which means less people.
The pool and grounds are quiet and the attendants are always spot on. If you are looking for a more lively pool scene, swipe your room key and you get full access to Mandalay Bay.
The room I stay in is stocked with a nice minibar and Bvlgari lotions and shampoos. Housekeeping offers two services a day - morning and evening.