Kaua'i is the oldest and fourth largest island in Hawaii. Often referred to as the Garden Island, Kaua'i is lush, green, and full of natural beauty. There is so much to experience on this gorgeous island including mountains, rivers, waterfalls, and beaches. Below is a list of incredible experiences that shouldn't be missed when visiting the slice of paradise that is Kaua'i. Kayak and hike to Secret Falls A great way to start your vacation in Kaua'i is with a kayak and hike to Secret …