Hands down, this is one of the best spot for concerts in Vegas (maybe only the Cosmo pool tops)!
My husband and I practically live at the Beach during the summer. They offer a great variety concerts in a completely laid back and fun atmosphere--it really let's you escape the hustle and bustle of the Strip. We've seen everything from Ziggy Marley to One Republic.
My only caution is the drinks are quite expensive and the bar lines are INSANE. Definitely grab some drinks beforehand!