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 is the oldest and most northerly of the Hawaiian Islands and is often referred to as the “Garden Isle” due to its lush, tropical rainforests and abundant wildlife. It is known for its stunning beaches and dramatic landscapes, including the majestic Waimea Canyon and the dramatic Na Pali Coast. 

Kauai offers a variety of activities for visitors to explore the island. Popular activities include hiking, snorkeling, kayaking, surfing, and boat tours. For those looking for a more relaxing experience, the island offers a variety of spas and golf courses. There are also many cultural activities such as visiting ancient Hawaiian sites and learning about the history and culture of the island. 

If you have a full day to explore the island, we recommend starting in the morning by driving up to the top of Waimea Canyon for stunning views of the island. Afterwards, you can take a short hike to the Opaekaa Falls or visit the Limahuli Garden and Preserve to learn about the native plants and culture of the island. In the afternoon, take a boat tour of the Na Pali Coast to get a closer look at the dramatic cliffs and hidden beaches. End the day with a sunset dinner at the Kauai Marriott Resort’
Kauai, the oldest and most majestic of the Hawaiian Islands! Nicknamed the "Garden Isle," Kauai is a nature lover's paradise, boasting lush green landscapes, towering sea cliffs, and sparkling turquoise waters. What sets Kauai apart from the other Hawaiian Islands is its unspoiled beauty, relaxed atmosphere, and abundance of outdoor activities. Here's a comprehensive travel guide to help you make the most of your 2.5-day trip:

**Overview of Kauai**

* Kauai is the least developed of the Hawaiian Islands, with a strong focus on preserving its natural environment and rich cultural heritage.
* The island is home to the stunning Na Pali Coast, Wailua River, and Waimea Canyon, often referred to as the "Grand Canyon of the Pacific."
* Kauai is a haven for outdoor enthusiasts, with endless opportunities for hiking, surfing, snorkeling, and kayaking.
* The island has a laid-back, small-town feel, with a strong sense of community and a slower pace of life.

**Unique things to do and see on Kauai:**

* Take a boat tour or hike along the Na Pali Coast, one of the most breathtaking and remote coastlines in the world.
* Explore the Wailua River and Fern Grotto, a natural amphitheater covered in tropical plants and flowers.
* Visit Waimea Canyon, a stunning gorge carved by the Waimea River, offering breathtaking