Another great toddler + Christmas tree hack! So simple, but it works for Carly of durhamregionbaby.com:
This is a little late, but I just discovered it the past week or so since our tree has been up. Our daughter is almost 2, and into everything as most 2-year-olds are. I was concerned about how our Christmas tree would fare under her inquisitiveness and boundary testing. So I picked up some inexpensive, non-breakable ornaments just for her — in our case, one Elmo and five Dora plastic decorations — and hung them right at her eye level in one cluster. Now, although she LOVES every part of the Christmas tree, she is most enamored with her little spot of ornaments. She likes to poke them and tell stories and grasp them all in her hands. And she loves to show them to all our visitors. I will often find her standing there quietly just admiring and gently playing with her "Lucy ornaments."
Related: Childproof your Christmas tree with jingle bells