as long as you are gambling, even playing the slots the drinks are free, you just leave a dollar per drink on the cocktail waitress tray, every time you see or hear "cocktails" call her over.
At check in ask for a copy of the Whats On magazine [ its free] there wont be enough time to do all that is advertised., take in the free shows [ the Rio is great], eat at a different hotel each meal, the buffet in each hotel is good and you can really fill your face, have breakfast buffet and take some of the fruit offered with you for a snack in your room/lunch.
Best evening buffet [ for me] Treasure Island [ think they call it the T.I. now].
most hotels have a small supermarket where you can buy booze etc for the room, every floor has a free ice machine.
The shopping is just great, try Ross [ dress for less] store near the Riveira hotel and almost opp Circus Circus for great bargains [ its like TXMaxx but better] also the Outlet Malls.
The Malls on the Strip are geared for tourists and pricey, take a taxi to the Boulevard Mall where all the locals shop theres a taxi rank there to come back.
Youve got so many choices, its just like Disneyworld for grown ups, enjoy it.