Kauai in December is typically rainy. The good news is there are still things you can do while it's raining. There will always be shopping, but if you're looking for an outdoor activity, surfing lessons or going on an ATV tour are a fun way to spend the rainy day!
Aloha Surf Lessons Kauai
Surfing Lessons Poipu Kauai Hawaii
Professional Surfer Chava Greenlee's Kauai Surf School