Do you know if your guests have passports? If they don't, will they be willing to get them? That will be required for Mexico.
Hawaii is magical and many people have had it on their "to go" lists but have not made it yet, so you could be helping them have that "dreamed about" vacation at the same time as celebrating your wedding.
Nothing beats the spirit of Aloha.
An All Inclusive experience can be fine if it's the right All Inclusive but they are not all the same and the Mexican experience will be very different from that in Hawaii.
A wedding in Mexico comes with other decisions and possibly some requirements (for ex: if you are having a legally binding ceremony, some states in Mexico require the bride and groom and sometimes the attendants, to be there several days in advance of the event.) There also could be additional costs for translation of documents, etc so there are many things to consider in your decision.
It may be easiest to decide by determining what kind of event and experience you really want to have because any destination wedding will require things that wouldn't need to be done at if it were happening at home.
Make it what you want it to be and enjoy the journey.