This is the time of year that the resort and the island are starting to ramp up for the busy season. The ocean is too cold to swim in, although my crazy kids were splashing around up to their waists. The pools are heated and it is great bike riding weather. If you get an unlucky cold spell it usually only lasts a couple of days.
Last year, if my memory is correct, the week started around a windy 70 degrees (high) and warmed up to the low 80's by the end of the week.
We swam every day because the pool is sheltered from the wind. Every day was sunny. Have fun