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This is not intended as legal advice. No attorney / client relationship exists because of this response.
It sounds like you're answering this question in the hypothetical and aren't really facing charges. My best hypothetical answer would be to let someone else drive the boat if you end up drinking. If you are actually facing the charges, seek experienced DUI representation in your home State ASAP.
It would be best to consult with a local DUI attorney.
Mr. Driessen is a former Deputy DA in Orange County with over 8 years of criminal law experience. Nothing stated on this site shall in anyway be construed as legal advice, or as creating any attorney client relationship. If you would like to hire Mr. Driessen, feel free to contact him at www.theocduiguy.com.