Marvelous beach that looks like from a postcard. Also, the lagoon is great for snorkeling, scuba diving and swimming.
Wikipedia http://en.wikipedia.org/wiki/Ha%CA%BBena_State_Park#Beaches
To-Hawaii http://www.to-hawaii.com/kauai/beaches/tunnelsbeach.php
Address 96722, United States
Coordinates 22°13'27.616" N -159°33'36.502" E