This cake was for my nephew's 3rd birthday. I got many great ideas from other cakes on this sight - Thanks! I think my husband enjoyed this cake as much as my nephew because he got to go crazy with the dry ice to help the volcano erupt. We had better pictures of the eruption, but the best eruptions make the cake hard to see. Anyway, chocolate cake with peanut butter filling. Chocolate buttercream and regular buttercream icing. River is piping gel tinted blue with tin foil underneath to add texture.