The ornamental design for golf fairway sign, as shown and described.
FIG. 1 is a front elevational view of a golf fairway sign showing my new design, with the rear being plain and unornamented, and with the sides being of no substantial thickness, and with the broken line showing for illustrative purposes only and forming no part of the claimed design;
FIG. 2 is a front elevational view of a second embodiment thereof; and,
FIG. 3 is a front elevational view of a third embodiment thereof.