Re: Cooking onboard
Your options are almost limitless. Depending on how much time you want to sit at anchor or at the sandbar that is.
We have set up the grill on the pontoon and put baby backs on it only coming back every so often to check on the fire and give them a flip. (And make sure the boat was still there

)
If we don't have someone to take the toon out, or we are going away, we just set the small grill up on the beach and cook smaller quantities.
We cook on the boat just as we would at home on the patio.

We're talking garlic bread, beans, and good meat.
Chops don't take too long on a good fire, nor do brats (even less if you boil them up in some beer and onions the night before). Use your imagination and don't be scared.
So, I guess the only limits would be room for another cooler or room in the cooler and the size of your grill.