It's amazing how fast Vegas around you melts away when you're here -- well, as much as you can avoid it without the Strip lumbering over the valley. But this museum/nature repository is my in-city choice to escape, well, the city!
Between the neat exhibits (the new one comes in Feb 5th), the trails where you can actually catch some wildlife on-scene, and the fresh air, you'll find something to make you smile. And really tired. This place seems a big hit with new parents, and it's very kid-friendly (not friendly to an adult's back sometimes). Lots of big interactive projections will secretly get them to learn about the environment around the Vegas valley.