If you're looking for a way to beat the heat, here is your answer!
Cathedral Rock Trail is one of the many trails on Mt Charleston. There is a good size amount of parking but can get pretty packed by afternoon. Convenient bathrooms are here that seem to be stocked and maintained. If you brought your furry friend, pet waste bags are also available at the beginning of the trail.
This trail is only a few miles but gains quite a bit elevation. When you look at the top it seems so far away and a strenuous hike. On the contrary! I am not an avid hiker by any means and it only took us about 45 minutes to reach the top and 30 to make it down. That was with multiple stops for me to catch my breath. Several benches are along the way for rest or to take in the beautiful view.
Once you reach the top you'll feel the sense of accomplishment and enjoy the scenery! For those of us who can't live without their phone, I did get a signal the entire hike up. As far as weather, it was about 30 degrees cooler than the Vegas area. A nice relief in the summer!