Cancun resort-las vegas?

i will be staying in cancun resort las vegas surrounded by dec -jan time frame. Do people do swiming and sit surrounded by the spa at that time. Do they have indoor juccuzi. Is it a worst time to travel in cancun resort contained by that time frame

Answers:

Dec is cold for the pool.
But sometimes in Dec it can be 70 degree.
Just do not be disappointed.
Last year it actually snowed within Henderson in December.