Waikiki has to be one of the ultimate tourist destinations on the planet.
Famous for its beach, Waikiki today has an eclectic mixture of stuff for tourists to do - walking, viewing, eating, drinking, shopping, watching the world go by. The traffic is slow, the retail experience is very good, the nights are warm and there are lots of places to get something to eat or drink. Sit on the beach, ride a scooter (no helmet required), go to Kuhio Park or climb Diamond Head, view the statues or stroll Kalakaua Ave. Basically go to Waikiki
Haena Beach on the Big Island was one of my favourite beaches along with the north shore of Kauai. The north shores of all the islands are spectacular, especially during the winter with all the big waves (but this means it can be very windy for camping.)
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.
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