Blue Springs State Park in Orange City(near Deland) is also closed for diving & swimming during the winter months when the manatees make their way into that particular spring. If your group is at least cavern certified, they will allow you to bring a light and it’s a great dive...during the rest of the year. 100+ft in depth.
Most of the open water springs are west of the Lake City-Gainesville-Ocala areas. Would join you if I wasn’t out of town that week.