Give me a detailed travel guide of Kauai. Start with an overview of the island – what sets it apart from the other Hawaiian Island, unique things and sights that you can only do/see there, and so on. Then, divide the Island into key areas, breaking down each one and suggesting things to do in each, as well as an estimate on how much time should be allocated there. I will be there from Sunday (arriving midday/late afternoon) to Tuesday (departing late at night).
Give me a detailed travel guide of Kauai. Start with an overview of the island – what sets it apart from the other Hawaiian Island, unique things and sights that you can only do/see there, and so on. Then, divide the Island into key areas, breaking down each one and suggesting things to do in each, as well as an estimate on how much time should be allocated there. I will be there from Sunday (arriving midday/late afternoon) to Tuesday (departing late at night).

Kauai, known as the Garden Isle, is the oldest and fourth-largest of the Hawaiian Islands. It's characterized by its lush green landscapes, dramatic cliffs, and breathtaking natural beauty that sets it apart from the other islands. Unlike the more developed islands of Oahu and Maui, Kauai maintains a more laid-back, authentic Hawaiian vibe.

Unique to Kauai are the Na Pali Coast's towering cliffs, accessible only by boat or helicopter; Waimea Canyon, the "Grand Canyon of the Pacific"; and the Wailua River, where you can paddleboard, kayak, or visit the Fern Grotto.

Here's a suggested itinerary for your 3-day trip:

**Day 1 (Sunday): Arrival & North Shore**

- Afternoon: Arrive at Lihue Airport (LIH). Pick up your rental car and head to your accommodation.
- Evening: Explore Hanalei Bay, known for its beautiful beach, surf, and stunning mountain backdrop. Have dinner at one of the waterfront restaurants.

**Day 2 (Monday): East & South Coast**

- Morning: Visit Wailua River and take a boat tour to the Fern Grotto.
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 Overview of Kauai:
Kauai, also known as the "Garden Isle," is the oldest and fourth largest of the Hawaiian Islands. It is famous for its lush greenery, dramatic cliffs, and stunning beaches. Unlike the other islands, Kauai has managed to maintain its laid-back, small-town feel, making it an ideal destination for travelers seeking a more authentic Hawaiian experience. Some unique sights in Kauai include the Na Pali Coast, Waimea Canyon, and the Wailua River.

Day 1: South Shore (Sunday)