Moorings charges $35 for a 2nd dinghy. They don't have bigger dinghies. (not to contradict George, but that's what I was told. If your mileage is different let me know because I would have a bone to pick with my booking agent.)

They will arrange logistics of a larger dinghy from Island Time if you pay directly. http://www.islandtimeltd.com/
I think it was $200/day for the week for a 15' center console.

Also, they don't allow anything bigger than the standard dinghy on the davits due to the load.

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A man with a plan is a better man than a better man without a plan.