You do not need a boat. Take a taxi from Rosseau to the entrance of the park. You pay a small entrance fee (I can't remember the exact amount) and they'll tell you where it is. There is a marker buoy in the general vicinity. When I went I was the only person in the whole area. I saw several varieties of moray eels. The champagne bubbles aren't as obvious as I had expected, but you can find many little fissures with fine bubbles coming up from the ocean floor.
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