Yes, Florida has a state-wide curfew for minors. A minor cannot remain in a public place between 11 PM and 5 AM, Sunday through Thursday. Holidays remove this curfew. If your child is with you, the curfew is unlikely to be enforced.
However, many places become less family-friendly around 11 PM anyway. While it’s unlikely an officer will insist you take your children home, it’s best to plan around this curfew. That way, you aren’t caught off guard by a sudden bedtime.