The ornamental design for an inflatablewaterwalkway, as shown and described.
FIG. 1 is a perspective view showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a front elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right side elevation view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines showing a valve, a front-side zipper flap, a rear-side zipper flap, end portions of a left-side zipper flap, end portions of a right-side zipper flap, and a middle section of an inflatable water walkway of FIGS. 1-7 form no part of the claimed design.