Missy, I am in Southwest Florida, Fort Myers/Napes/Cape Coral: There are a couple of kayak outfitters to consider:
Estero River Outfitters : http://www.esteroriveroutfitters.com/
Florida Paddles Sports : http://shop.floridapaddlesports.com/

They can direct you to rentals and club organization.

We also have the Calusa Blueway: It is hundreds of miles of mark kayak waterway.
http://calusablueway.com/
http://www.calusabluewaypaddlingfestival.com/

I think the strength in our area is the variety of paddling: Open ocean, open bay, saltwater bays, saltware mangrove line rivers, back bay mangrove island paddling, freshwater rivers, freshwater rivers... In city paddling of over 200 miles of freshwater and saltwater canals.

Enjoy your new adventure!