Kauai, Hawaii Tours
Kauai has some fantastic tours for people of all ages and interests, including the Canyon and River Combo tour that combines a cruise up the river and a bus tour. It will take you to the best sights that can be approached by ship, bus, or foot on the island. If you are interested in learning about all of the tours that are offered on Kauai, then you should go to All Kauai Hawaii Tours website. There you will find descriptions of the tours and pricing, as well as spots to book the tour. They advertise that they are the cheapest everyday prices that you will be able to find.
Helicopter Tours in Kauai
Will Squyres has a perfect safety record and offers some of the most popular tours of Kauai. Will, the owner and one of the pilots, has been used by movie companies as a consultant and pilot with big name movies like "Jurassic Park" and "The Lost World." There are several other helicopter companies that tour the island of Kauai, including the originator of helicopter tours in Hawaii, Jack Harter Helicopters. Another touring company is the Safari Helicopters company. They have some of the longest tours for the cheapest prices if you book online. They also sometimes have seasonal promotions that may bring the price even lower.
ATV Tours
For the more adventurous, Kauai has ATV tours that you can go on. ATV tours are among the most fun way to spend an afternoon, provided you know how to use one. If you don't, then you should probably learn before going on a tour that requires that you drive one. If you can and want to drive an ATV on a tour, then Kauai has that available just for you. You can either go to the website listed above for their ATV tours, or you can go to Kauai ATV where you will find a company that gives ATV tours.
Other Tours of Kauai
If that doesn't interest you, then you can try the boat tours (kayaks and canoes are available) or a bus tour. Each of these are great and are built for specific types of people. If you enjoy riding an ATV, go to the All Kauai site and book the ATV tour, if you enjoy the more easy riding of a bus or a boat, the website has that as well. Find the tour that fits your interests and book it on their website, which is probably the cheapest you will be able to find.