Ok, thank you for the help! I called Beach Club and asked to order a cake for our illuminations cruise. The person helping me told me that only a 10" or larger cake can be personalized the way I want it.
She gave me a choice of white, chocolate or marble cake. Buttercream, white chocolate, fruit (strawberry I think), or dark chocolate filling and buttercream or whipped cream frosting.
She said they would not do any 3 D designs for a cake that would be served on a boat. (Makes sense to me).
Then she asked me what I wanted. There will be 8 of us on the cruise. I said, well, I guess we will get the 10" cake,

scared1

. I ordered marble with dark chocolate filling and buttercream frosting, although I would have preferred whipped cream. (Didn't think that would have stood up so well on a boat).
She asked how I wanted it decorated. My grandsons, 2 and 4 LOVE Figment. Since it is an Illuminations cruise, I thought it would be fun to have Figment surrounded by fireworks. She told me she would talk to a chef and get back with me.
She called back in about five min.

. She said they could do a Figment cake, reconfirmed my choices and told me she would be back with me in a day or two with the price and confirmation information.
Ten min. later, my phone rang. It was all confirmed, will be delivered to the boat with plates, forks etc. Price, including tax, gratuity etc, $97. I have absolutely NO idea what this cake will look like?

I just hope it tastes good.
Thank you again!! I'll post pictures when we get home!