I have lived in Vegas for 13 years now and I can't believe I have just now visited the Super Summer Theater!! I have seriously been missing out - this is such a hidden gem.
Only about a 30 minute drive out of the city, the theater is located at Spring Mountain Ranch, just past Bonnie Springs. It's a beautiful drive and you definitely feel like you are leaving the dessert. The temperature is usually about 10 degrees or so cooler out there as well.
We saw "In the Heights," which was fantastic. I absolutely love the atmosphere - although there are concessions, you are allowed to bring in your own food/drink (alcohol included!). People next to us had a cooler that doubled as a blender and they were mixing up drinks. The shows usually start at 8pm and we got there around 6:30pm so that we could eat and enjoy some time catching up before it got dark.
This is seriously a great experience and family friendly. I highly suggest you go check it out if you haven't already!!