Sin City Smash is a unique experience. I recommend trying it out if you're looking for something that's not just the same old LV Strip stuff. I've taken a few friends as, well as a bigger group from work, and it was a big hit every time. With the big group they were well organized and even let us bring pizza for a little pizza party.
Everyone is always friendly and helpful. Plus I have to say the weapon upgrades are a lot of fun.
Also, from an environmental standpoint, they have a lot of items donated to them that are on the way to being recycled. Guilt free wreckage!