Already did Antelope Canyon? An aerial tour of Lake Powell and Rainbow bridge is a great way to see the rest of the area. Like the Grand Canyon, the lake is simply too large to see from a single viewpoint. The best way to grasp the scale and beauty of the area is to be above it.
In addition to Lake Powell, you will fly over Rainbow Bridge. This is the largest natural bridge in the world, and a United States national monument. It takes about 2 hour to get there by boat, and then you have to hike about a mile with how low the water is.
Highly recommended tour. It’s a great way to spend 25-30 minutes.