The ornamental design for an avianactivityset, as shown and described.
FIG. 1 is a perspective view illustrating my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The broken line disclosure of an exemplary cockatiel and food in the food dish as shown in FIG. 1 and the exemplary volleyball markings on the hanging ball as shown in FIGS. 1–6 are for illustrative purposes only and form no part of the claimed design.