Bars: There's a Irish Bar in NYNY that has a live band every night, good craic. Worth a visit.
Eats: Cheesecake Factory in Caesar's Mall (does other stuff than cheesecake), Noodles - Bellagio, Grand Cafe De Lux - Venetian and Nine (steakhouse) in the Palms is meant to be amazing, if pricey.
Have a great time.
Yes as has just been said, is called Nine Fine Irishmen. Went there, very good, also has proper Guiness. The Duke got very drunk when we went there LOL...
For a restaurant, best one we went to was on the 54th floor of the RIO... Food was Brill and the view across Vegas was excllent.. It was called the Voodoo Lounge...