Use the cake mix to bake two 9x13 cakes (2 boxes per cake) and one 8" or 9" cake. Let cool.
Start with the 9x13 cakes and level both.
Frost one cake with white icing, then place the second on top
Cover 1/3 of the cake with white icing, then the remainder with blue icing
Cut the round cake in half and use frosting to put them together back to back in the shape of a mountain (see pictures)
Carve the top to make it look more like Te Fiti turning into the mountain
Frost with green icing and cover with candy flowers
One the opposide side, make a line across the cake of blue icing and another line of white icing
Swirl together to create the effect of waves crashing on the beach
Add palm trees to the edge of the beach
Sprinkle crushed vanilla wafers over the white frosting to look like sand
At the water's edge, gently push the bottom of the wave into the cake. Using a small spoon or knife, dig about 1/2 inch of the cake out to make a spot strong enough to hold the wave. Fill the hold with melted candy and add the wave, securing in place to keep it from toppling over.
Place the green heart of Te Fiti candy under the wave and put the Moana figurines on the beach in front of it.
Place the seashells around the cake
Enjoy!