Little Sahara is my favorite in utah but Coral Pink dunes, Sand Hollow are fun dunes as well Sand Hollow are smaller dunes but they run right into a lake so that is cool. If you feel like something other than dunes Knolls is fun. Tons of places in Utah. You'll have to let us know where and when your going see if us locals can meet ya. Any color flag is fine mine are dark blue and red.