You HAVE to hit the state parks.... Manatee Springs has Catfish Hotel and the main spring.... Catfish is covered in duckweed, do it early, do it first and be the first divers in for the day. Rinse off in the main spring.... After diving at Manatee Springs, drive north a bit and do a dive a Fanning Springs... it is shallow 20' at the spring basin... These 3 dives are a days worth.. make sure you have tanks... at LEAST 2 for the 3 springs, more if your SAC is high.
Blue Grotto is a better dive (deeper dive) than Devils Den.... I tended to keep devils den dives for when local shops were doing night dives there.... the night dives are cheaper... Again be there early for Blue Grotto, busy days make for low visibility.
Ginnie Springs is expensive and really not worth it unless you have a cavern cert... you can dive the ballroom as an open water diver but not a lot to see after a few dives into the ball room.... The springs run is fun, but again if your not cavern there isn't much to see.
Troy is awesome.... (also a state park) you can spend quite a while circling the walls of the basin looking for critters... but the best part is going out the the shipwreck (just ribs but still cool) Troy is the turtle spring you will see many as you swim to the wreck....
Itchnetuckny (also a state park) is an AWESOME snorkel and I heard something about either they were now open year round for cavern divers and MAYBE OW is allowed now??? not sure about that last part, but take your mask fins and snorkel and snorkel both the head spring and the area where the cavern is...
Orange Grove (at Peacock Springs State park) allows open water divers (its the first parking lot you drive to on way to Peacock) When you are done diving, do the interpretive walk (take bug spray) it will follow the cave above ground and has photos at certain spots of the cave below you.
NOW... the important info...
If you think you are going to go back more than once... a family park pass MIGHT be worth it... you can buy them at Itchnetuckney, Manatee Springs or Fanning Springs.... the family pass is $120 a year but covers ALL of the state parks in Florida..... Including entry for two people to Ellie Schiller WIldlife Park in Hommossasa and Weeki Wachee State park (live mermaid shows) in Spring Hill.... If there are more than just your wife and yourself.... I believe the park pass covers up to 6 divers as long as everyone is in same vehicle (sometimes they let you slide on being in 2 vehicles) and they don't have to be family...
All of the springs run on average 72 degrees.... Troy for some reason is 70....
I would make my base at Blue Grotto... specially if you don't have your own gear, then you can rent tanks and take them with you on the day you dive Manatee and Fanning... There currently is NO AIR FILLS near Manatee and Fanning... Blue Grotto is closest.... if you have your own gear, save Troy/Orange for your trip home making sure you have full cylinders on the way...
1st day Blue Grotto, 2nd day manatee and fanning, 3rd day Troy and Orange on way home.
Hope that all helps....
Tim