My wife and I visited Kauai on our honeymoon in September and enjoyed the island immensely for its outdoor adventure opportunities. We were happy to have used the services of Outfitters Kauai during our stay in Poipu. We went on their half day, 2 hours kayak trip. Our guide, Mathias, was very knowledgeable about the island and a good kayak instructor. We had both never kayaked and under his instruction we got it down and were quickly leading the group. Mathias was quick to point out different facts along the way and engage the tour group. We enjoyed lunch at a beautiful setting along the river accompanied by the main residents of Kauai, chickens.
Mathias was also a great resource for local tips. He recommended a secluded, local beach around Poipu that we wouldn't have otherwise known about. We went to the beach in the mid afternoon on a weekday and were the only ones there until 5 pm when I assume the locals were breaking off for the day. He also recommended good places for food in Poipu such as Da Crack right by the K.O. office.
I highly recommend them!