Stucco can be tricky to work with, but there are some methods you can use to safely attach Christmas lights to your stucco walls. One option is to use hot glue or double-sided tape to secure the lights in place, making sure to avoid any power cords or other wiring. Another option is to use a specialized adhesive specifically designed for stucco, which can be found at most hardware stores. Whichever method you choose, be sure to test it out first before applying it to your entire wall. And most importantly, have fun decorating!