The Globar is in the center of the casino. It's more chill and laid back. There's no place to dance in it. Just a small, circular area with a bar in the middle and couches on the outer wall—which is really just made up of curtains.
Jack Daniels has more of a nightlife with dancing and whatnot; however, when I used to go to La Barge I remember thinking that it closed pretty early, considering the nature of the bar. It could have changed by now. Also, drinks are stupid expensive. ...Which makes sense, I guess. Everything is expensive at Pinnacle's little resort.
You might also be interested in Party by the Pool, which the casino puts on in the summer every Thursday by the... Well, you know... By the pool. They have guest DJs or other music performers and it's a party atmosphere. Don't know how late that goes, as I've never been.
There are other bars/clubs around the city where you can go dancing and "partying" at, but most of them are pretty trashy. You can take a look at this and that might help you out. There's also this, which lists more venues, but isn't as informative (Crystal's is a gay bar, Plantation is a strip club, etc...).
Good luck.