The ornamental design for a pad for supporting a recreational board, as shown and described.
FIG. 1 is a perspective view of a pad for supporting a recreational board illustrating an example environment of the pad for supporting a recreational board;
FIG. 2 is a perspective view of the pad for supporting a recreational board;
FIG. 3 is a front view of the pad for supporting a recreational board;
FIG. 4 is a left side of the pad for supporting a recreational board;
FIG. 5 is a right side view of the pad for supporting a recreational board;
FIG. 6 is a back view of the pad for supporting a recreational board;
FIG. 7 is a top view of the pad for supporting a recreational board; and,
FIG. 8 is a bottom view of the pad for supporting a recreational board.
The broken lines shown in FIG. 1 illustrate environmental structure that forms no part of the claimed design.