According to Weather Spark:
The month of December is characterized by gradually falling daily high temperatures, with daily highs around 79°F throughout the month, exceeding 84°F or dropping below 73°F only one out of 10 days.
Not sure if the water will be warm at the water parks. But I wouldn't want to be wet in 73°F personally, LOL.
Anyone on here that has experience traveling to BAHAMAS in December?