There are several islands to choose from in Hawaii. If you want black sand beaches and the volcanic almost lunar like landscape thing you need to choose the Big Island. Alternatively Oahu and Maui are well-known for their many lagoons which are perfect for private swim, and Kauai is known for its lush tropical beauty that has been mostly untouched. If you're finding it hard to decide where to get married; get married on one and spend your honeymoon getting to know the other islands of Hawaii. Hawaii's many resorts have wedding consultants on staff, and they are great planning resource for you to use. Once you decide which Island to marry on the call a few planners and let them to sell you on the benefits of being married at their resort.
To be married in Hawaii, you will need, valid driver's licenses or passports, and any written consents that you may need. Blood tests are not required, and once the license is issued is valid immediately but it will expire within 30 days. Both parties must be present to apply for the license.