My 1 year old and 4 year old are having a combined "Beach Theme" birthday party because their birthdays are 2 days apart. I'm looking for ideas on how to decorate a cake "Beach Theme". The cake itself is no problem, I just want ideas on decorating such as sea creatures, water theme, sandcastles, etc, whatever people might know. It'll have to be quite a big one because it will have to feed about 40 people.