I spent a holiday at an all-inclusive in Barbados a few years ago. My girlfriend at the time was with me. This was probably during the height of my alcoholism and I spent a week drinking from the moment I awoke to the moment I crashed in my room at night. I was ordering gin and tonics at 8am with my bacon and eggs. By noon everyday, I was smashed and could only sit on a lounger in the shade. My poor girlfriend was left to go swimming, jet-skiing, and exploring on her own.
An all-inclusive is paradise for an alcoholic like me. Not only is the alcohol unlimited, but you can get away with drinking all day and not have to worry about life back home and pretty much everyone else there is drunk all day too.
For the sober me, an all-inclusive is the worst place on earth. I suggest you consider changing plans.