We are heading down in a couple of weeks and I was just wondering if it is getting to cold at night to swim. I am trying to plan out the days there and am thinking I should plan for some time during the day to swim since it will be warmer. Any thoughts?

but I would plan a break in the afternoon and swim.
We did most of our swimming at night time and the pool was warm and inviting, in fact you could feel the warm water being pumped in through the returns.