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.
Poipu: Sunny Side of Kauai - See 72,655 traveler reviews, 6,044 candid photos, and great deals for Poipu, HI, at TripAdvisor.
Waimea is probably the driest of all the areas on the island but offers fewer accommodation choices than other locations. Poipu or Lawai, which offer an abundance of accommodations on the South Shore, are your best bet for a dry and sunny vacation. The area averages about 30-40 inches of rain each year. Kapaa on the Eastern (Coconut) Coast is your next best choice, averaging about 50 inches of rain annually.