FIG. 1 is a perspective view of the tub surround showing our new design; FIG. 2 is a front elevational view thereof; FIG. 3 is a top plan view thereof; FIG. 4 is a right side view thereof; and, FIG. 5 is a left side view thereof. The broken lines showing of the tub is for illustrative purposes only and forms no part of the claimed design.