as far as food, The Rio has a great buffet for reasonable price.
Mandelay bay has a nice one but is rather pricey now.
Clubs, Rain and Sky Bar at the Palms, trendy but fun.
Coyote Ugly in New York New York is fun to people watch in. Its free before 8:30.
Most taxi drivers will sale you club passes to bypass most lines so ask when you get in the cabs, know where you want to go because they will tell you where they get a kickback from only not what is actually the best.
for gambling...go to Sahara, only tables in Nevada that have $1 black jack...a few months back I sat at a table for 9 hours straight only taking piss breaks. You will spend more tipping the waitress every 20 mintues for the cold heineken then you will lose playing dollar black jack. I left the table with 20 bucks less then I had came with for 9 hours of gambling and a shat load of heinekens...cant go wrong at the Sahara. Cocktail servers are good eye candy as well.
You have to rent the scooters durring the day! They are about $30 for an hour plus you have to put a security deposit down. Those were so much fun to ride down the strip for an hour while nothing is going on!