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I went with Sea Quest who are based, along with a few other companies, at Keauhou Bay. You can get there from Kona using the free hotel trolley bus (it picks you up from the quay and drops you at the Sheraton just up the road).

The equipment provided was top notch (much better than the stuff at Hanauma Bay on Oahu) and there were light refreshments in between the two stops. We chose the "Deluxe Morning Adventure" which also takes you to Honauau Bay - near the place of refuge.
For that you need to get the shuttle leaving Kona at 7:30.

On the boat trip out we also saw a number of pilot whales a few miles offshore.

You also get to see a few interesting volcanic rock features, such as blow holes and lava tubes.]]> http://www.ivebeenthere.co.uk/tips/23187 http://www.ivebeenthere.co.uk/tips/21005
There is one beach (also a campsite) on the north shore of Kauai, also called Haena (if I remember correctly) which is at one end of the Napali coast. It means that you can make it your base before hiking along the coast, as there are small and big treks along this coast to beautiful waterfalls and beaches that you can only get to by foot. There is a lot of reef off the north shore, which makes for good waves, and also some good snorkeling. We were able to see a whole family of turtles while we were there.]]> http://www.ivebeenthere.co.uk/tips/21005 http://www.ivebeenthere.co.uk/tips/21003 spectacular. Nearby is the Thurston Lava Tube and the Chain of Craters
road, really reminds you of the power of the volcano. Stay in Volcano
Village.]]> http://www.ivebeenthere.co.uk/tips/21003