This post does not describe the formal tour where tickets sell out shortly after they become available and cover Old Town’s nearby neighborhoods on Christmas Eve. You can easily see Old Town’s luminarias on Christmas Eve by arriving early–before sunset. If you want to get out of the cold while you wait, plan to go eat at one of the open restaurants such as Little Anita’s.
The church is the main attraction, and people will be there with tripods set up blocking many views for other photographers. It is always good to take turns and share in such a situation.
The plaza is also a wonderful subject, both up close and far away. There is a vantage point across the street by going up the stairs to the veranda.
The walkways are also festive, but with electric lights. The actual luminarias are so labor-intensive to set up with a time limit on each candle that you can capture them on Christmas Eve only.