The mission at Tumacacori, just east of I-19 between Sahuarita and Nogales, is one of the most beautiful and peaceful places in all of Arizona. Make a day of it and drift around Santa Cruz county, but dedicate at least a couple hours (if not the whole day) to absorb the ages-old air at the mission. The park used to have a luminaria festival at twilight every Christmas Eve, but I haven’t been able to confirm if they still do this. If they do, it will turn into one of your most cherished memories.