Hi, Jdanao, welcome to the forum. There's a lot of competition for shop assignments in most areas of the country because there are a lot of mystery shoppers. Since different shops are available with different companies depending on the part of the country, those who could best answer your questions and provide detailed information are those who are already shopping in Hawaii and are your competition. Many successful mystery shoppers spend a lot of time researching the companies and keeping a detailed client list of those companies. Because of the time spent, most shoppers consider this a business resource that is very valuable.
My best advice would be to sign up with a lot of mystery shopping companies. Build yourself a client list of at least 50-100 companies. Many forum members are registered with 150+ and there are a number of our forum members who are registered with over 200. There's a great list of about 200 companies at the bottom of this page.
Best luck, and happy shopping!