My family and I will be spending a couple days in Las Vegas. Beginning on a Friday morning (in July) until we fly out again that Monday around lunchtime, we have some time to explore. We're planning to rent a car and explore some combination of Zion, Grand Canyon, Bryce, or anything else around there which may be better that I'm not thinking of. We also will have 8 and 10 year old kids with us. Any recommendations on what would be the best plan of how to spend each day, or what city(ies) to get a hotel? I was thinking we might want to make it back to Vegas by Sunday night and stay there so we're ready to go to the airport the next morning, but I'm open to any ideas. Just want to make it fun and entertaining, while seeing some of the main sites too. I realize in such a short time frame we're not going to see it all. I would guess we'd have to choose either Zion or Bryce--which is better?