Jack Brown's for warmer water, yes!
I got my water wings in Jack Brown's a few years back, that was a lot of fun, and if your family is involved, they'll enjoy the rest of Florida....
The course I was on had me, with 1,200 hours mostly in a Supercub, and a couple of airline pilots; that definitely gave me the advantage in a J3 on floats... but it takes nerve to taxi on the step!
Starting the engine is kind of special, too. Just step out on the float, and pull the prop through from behind; takes a bit of agility to climb back into the cockpit before the little darling goes her own way.
Also, when I first got there, I thought his lake was too small. But no worries, you just taxi like mad around the lake until you achieve takeoff....
Neat item; any lake in Florida that is not specifically verboten is your own little landing lake. Just anything else on or in the water has the right of way. And then there are those glassy waterlandings.....
Jack Brown will sign off your rating when the course is passed to his satisfaction, but he won't let you fly his precious J3 solo. The ticket only entitles you to buy your own......
Have fun!