I claim the ornamental design for a unicorn beach shoe, as shown and described.
FIG. 1 is a front perspective view of a unicorn beach shoe showing my ornamental design;
FIG. 2 is a front view of a unicorn beach shoe showing my ornamental design;
FIG. 3 is a rear view of a unicorn beach shoe showing my ornamental design;
FIG. 4 is a right side view of a unicorn beach shoe showing my ornamental design;
FIG. 5 is a left side view of a unicorn beach shoe showing my ornamental design;
FIG. 6 is a top view of a unicorn beach shoe showing my ornamental design;
FIG. 7 is a bottom perspective view of a unicorn beach shoe, showing a portion of the right side of the unicorn beach shoe, and showing my ornamental design; and,
FIG. 8 is a bottom perspective view of a unicorn beach shoe, showing a portion of the left side of the unicorn beach shoe, and showing my ornamental design.