It really does depend upon your skills level and sight reading ability. If you want to accompany, there may not always be time to have an advance look at the piano part. You could play in Care Homes, where I have quite frankly encountered some very low standard pianists who get away with it because no one expects much in the first place.
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Kauai's south shore is also home to several good snorkeling sites, including Lawa'i Beach, which is also known as Beach House Beach. Although this area does not have the best reef system, it is teeming with lively tropical fish and the waters are usually clear and calm, especially in the summer months.