Here's my obervations on my trip to Hawaii. I've been to four Hawaiian Islands.
Oahu,
Maui,
Kauai,
and
The Big Island. Each one has it own character there's not one I'd choose over the other its just a matter of what your looking to do.
Oahu- The most touristy of the islands and personally my least favorite but I'm not into the big city crowds when traveling. My favorite here is the
North Shore
Maui- Beautiful Beaches, Exellent hotels, great out of the way destinations! just take a trip down
Hana Highway! but be prepared for some rough roads.
The Big Island- Volcanos, Diving, Small Towns, and several high-end resorts on the Kohala Coast and around
Anaehoomalu Bay. the Big Island also has the famous
black sand beaches.
Kauai- the nature island. One of the more popular Kauai Beaches is
Tunnels Beach on the Northside of the island. The
Na Pali Coast is is just amazing! Take a
Helicopter Tour or a
Catamaran Tour to get the best views of the Na Pali Coast. The towns are small, the people are friendly and the food is good!