Is there anything to do in and around Vegas that does not include drinking or gambling?

I am going to Vegas for the weekend to see DMB. Thing is, I am not really into Vegas. I do not drink and I do not enjoy gambling. My nights will be occupied by the shows. What is there to do during the day?

Please do not say Hoover Dam—boring. Anything natural that is interesting to see? Any museums or local attractions to visit?