When is the best time to go?

Anytime!  Florida weather is good all year round.  As a rough guide, November, December and January can have variable weather with some cloudy days and sometimes a little cool, especially at night.  May to September have are more consistent with hot sunny weather.  July and August can be very hot and humid and subject to tropical storms-heavy rainfall that passes quickly. Hurricane season is August to November but is rarely serious especially in central Florida