I would dump the bowling ball (it will be about as useful as an aquarium on a boat).
Keep tools, including some of the small power tools (electric drill, sander, jig saw) and car maintenance tools since they can be used on your boat.
Get rid of everything that is "hard" you will never store it on the boat.
Keep some games (dominoes, cards, etc) that are small and easy to store.
Keep a couple nice serving dishes, you will entertain on your boat.
Keep your good pots/pans and sell the ones that won't fit on the boat or stove.
Dump most small appliances, learn to cook without them.
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