Island in the Sky was our favorite district within Canyonlands. Although it was definitely more crowded, you can drive between all of the attractions, and the hikes are all short and easy with just as rewarding payoffs. If you only have the time or energy for one, definitely do Grand View Overlook (at sunset for an extra bonus), because the view of the white rim is stunning.
The Grand View Overlook parking lot is easy to reach by car, and there were plenty of other hikers at this very popular overlook. It's a very easy but scenic trail - Clark and I actually hiked it all in flip flops. If you only have time for one short hike at Island in the Sky, I would recommend this one!
Arches NP is a unique park in that all of the points of interest are quite far apart and there aren't too many hiking trails. We decided to do a car tour with minor hiking, and it was nice to be a tourist and just get out of the car to take pictures, since it was so hot. Even though the park is a little out of the way, it is worth the trip to see some rock arches.
Bryce canyon is a relatively small National Park, but if you are in Utah you should definitely make a small side trip to see this unique canyon. There aren't too many trails to choose from, but if you have a couple hours to spare, this easy dayhike is the perfect way to see all the best parts of the canyon up close. The trail is well-maintained with not much elevation change, the only downside is that it is quite exposed, dusty, and can get pretty hot in Utah sun. No matter how long you expect to hike, be sure to bring extra water.
