Springs Preserve has a lot to offer:
1. Introduces kids (and adults) to the flora, fauna, and environmental influences of our fair Mojave desert, specifically the Las Vegas valley.
2. Showcases local plants beautifully.
3. Provides an awesome outdoor amphitheater for small concerts, beer fests, etc.
4. Hosts the weekly "bet on the farm" farmers market.
It's not the best in the country in this genre - actually, I refer to it as a poor man's version of the Desert Botanical Garden in Phoenix or the Desert Sonoran Museum in Tucson - but it is the best in Las Vegas, so appreciate it bitches!
Bonus: I don't know how much general admission is, but it's free on Thursdays if you go to the farmers market.