Christmas Tree Cave is a Key Largo swim-through site in a protected reef area, centered on a cave-like opening crowned by a large star coral that gives the spot its name. The main attraction is the overhead feature itself, but the surrounding reef also offers several nearby ledges and swim-through options that let divers keep the dive interesting without turning it into a technical cave exercise. Nurse sharks and eagle rays are two of the most repeated wildlife highlights around the site, and the protected setting helps keep the reef topography and coral structure visually distinctive. Christmas Tree Cave is best treated as an intermediate boat dive for divers who are comfortable with overhead awareness, reef positioning, and following the guide line through short swim-through features.