High cliffs nearby to the west for afternoon shade. Centrally located so you can run about the lake and sight-see the area. At Lake Powell, this means not camping 5-7miles back up into a canyon, increasing your gas consumption and limiting your flexibility to visit other canyons. Absence of insects. Generally speaking there are always insects.
Gnats are the most prevalent, while flies can also be annoying.
Their cattle use Lake Powell for drinking, hence there can be a lot of cow poop along the shoreline, a source for flies. There are a lot less flies on north shores of Lake Powell, since flies won't fly across big bodies of water. Houseboat Navigation after 4pm Late afternoon sun can reflect off the water and easily impair the captain's vision. Although many submerged rocks are marked with buoys or milk cartons, there are many unmarked shallow rocks. You have to be careful for those unmarked hazards.