RiRa Irish pub in the Mandalay Shoppes is my absolute favorite, food, ambiance and service is top notch. Live music late night and they play the games on big screens.
If you don't mind the drive Auld Dubliner at Lake Las Vegas is a beautiful pub. They have darts and sometimes have Jenga, which is a lot of fun especially after a few pints! The best fish tacos, ever! *drools!
JC Woolaughan in the JW Marriott is also a very nice pub, only have been there twice though. Wish it were closer, I might need to move! 
If you haven't guessed I'm a big fan of pubs!
Satay makes very tasty drinks (I recommend the ginger martini or mango mojito) and has a really good Happy Hour.
Steiners is the best all around, a short distance away from the main drag but open 24/7 and has the best food and bartenders.
They keep changing the name of this place but the service and food remains the same, awesome! Allegro at the Wynn has a bar I love to grab a drink and pizza, soup or salad.
Il mulino in Caesars has a great bar also, they do a lot to make sure you're comfortable and that's huge in my book!
I agree with The Fireside lounge inside Peppermill, very snuggly and great for any kind of small gathering. Definitely a must see and I don't do the tourist thing, but I will bring all my friends here. They all get a kick out of it!
Yes, Chandelier Bar is awesome. I also like that aquarius bar at ceasar's that overlooks the pussycat dolls dancers. And Heart Bar in PH for the dancers and sfantily clad servers. Noticing a pattern here? But y'know what's great? On a nice hot day, go to the top floor of Twin Peaks at Harmon center (or is it corner?), get a draft beer at below freezing temp, and sit outside with a center-strip view and people watch. Also there are scantily-clad twin peaks girls. You're in vegas. Have some eye candy with your booze!
