To compute the surface area of the triangular pyramid, we need to calculate the area of the triangular faces and the area of the base.
Area of each triangular face = (1/2) * base * height
= (1/2) * 16 * 13.86
= 111.36 in^2
Total area of all triangular faces = 3 * 111.36 = 334.08 in^2
Area of the base = 16^2 = 256 in^2
Surface area = Total area of all triangular faces + Area of the base
= 334.08 + 256
= 590.08 in^2
Therefore, the surface area of the chocolate tower is approximately 590.08 in^2.