Before I hit two months, my husband and I went to St. Maarten and had a wonderful sober vacation. While all his co-workers were getting drunk and then wasting half the day hungover, we were working out in the resort gym, going swimming in the ocean, eating delicious meals, and enjoying each other's company. It made a big difference at that point to have someone who also didn't drink with me, and my husband quit drinking one week after I did.
Viewing alcohol as nothing but poison was also a big help and remains a great help to me today. Ever since the first day I got sober, whenever I look at someone drinking or thing about it, all I envision are the headaches I would get when drinking alcohol and the weight I gained and the lack of sleep I had and I have zero desire to drink.
Enjoy your trip! It will be such an amazing place, and you can see and do so much more when you're not under the haze of alcohol.