We're planning a family trip (two adults, two teenage boys) to the Zion/Bryce area in August. I'm assuming that we can do a fair amount of hiking and other activities in those parks in three days. What other sites do you suggest we do in the remaining day and a half that we have? I was considering the north rim of the Grand Canyon, but looking at other posts has made me wonder if the long driving times would not be the best use of our time. There seem to be so many beautiful sites in the area but at this point I'm not sure what to do. We'll be flying in and out of Las Vegas, if that makes any difference in your suggestions. Thanks so much for any ideas.