There's a lot more to Vegas than just the LV strip, casinos, shows/concerts, and restaurants depending on your particular interests. My mom lived in the area for close to 15 yrs before she passed away, so I use to visit Vegas quite often and I still go 1-2 times per year. For better values, stay away from the strip. Lodging, shopping, dining, etc. is a lot less expensive if you go where the locals go. Even gambling is better at the local casinos.
For those who like the outdoors, Red Rock Canyon is a cool area for hiking, as in the Valley of Fire. Mt. Charleston isn't far from Vegas and the temp is usually cooler up there during the dog days of summer when the temps in Vegas climbs to well over 100F. They also have a ski lodge where you can grab a bite to eat.
You can take side-trips to places like Hoover Dam, Lake Mead, the Grand Canyon, Laughlin, and Primm (Whiskey Pete's in Primm has Bonnie & Clydes Getaway car on display). If you have more time and like driving, there are other national parks within a few hours from Vegas.