1Heat oven to 375ºF. In large bowl, beat sugar, butter, vanilla and egg with spoon until smooth. Stir in flour. Pat dough in ungreased 12-inch pizza pan.
2Bake 8 to 10 minutes or until set and edge is light golden brown. Cool completely in pan on wire rack, about 45 minutes.
3Spread frosting on cookie. Squeeze decorating gel randomly in about 16 spots on frosting. Pull fork through gel to make wave designs. Place licorice on waves for "rope." Cut fruit roll into triangles; place by licorice for "flags." Place gummy rings candy on waves for inner tubes. Roll up end of gum sticks for "inflatable floats;" place on waves. Place cookies on waves for "rafts." Add graham snacks for "people." Add gum balls for "beach balls." Add gummy sharks candy.