To me, these are amongst the most beautiful of the wasps. They are large, have a nice crisp black and white appearance and gorgeous big green eyes, which you cannot see in this shot. This one was circling the parking lot in front of the center, beyond the gravelled section, clearly looking for a place to dig a nest. She made repeated stops on the ground, explored briefly, flew off a few feet, repeated the process, and at one point appeared to start digging, but didn't continue.