I think I've found a place unique to Vegas -- don't know how true this statement is but it didn't have that chain feel to it.
Located in a strip mall five minutes away from Las Vegas Blvd. (aka The Strip) is this spot that serves some really tasty tapas and refreshing drinks. The one thing I will mention about the tapas: seafood dishes are good.
Firefly is loud, crowded, and totally fun. You got folks getting off of work and looking to unwind and chill, groups celebrating b-days, couples enjoying the setting, and a crowded bar with people waiting for the next open table.
The staff is fairly friendly and very accommodating. They were especially cool about my request for pitchers of caparinias instead of glasses.
The only thing is parking can be sparse since Firefly shares its parking lot with Ruth Chris's -- so be prepared to search.
Overall, local or not, you should give Firefly a try.