There are not too many operators willing to hire 6 seaters because of the horrendous extra insurance requirements.
I've known one place take the middle row of seats out of a Seneca and have it declared as a four seater in order to be able to afford the insurance.
There is, however, someone running a couple of Seneca V aircraft at Orlando International.
I would strongly suspect that you could get a six seat aircraft from Air Orlando at Orlando Executive Airport.
Have a llok at
www.airnav.com try "Airfields" tab and enter the identifier "KORL" (without the quotes).
It should list all operators at that airfield.
I know that
www.parisair.com have various Seneca models and a PA31 Chieftain (grown up Navajo) at the Vero Beach facility if you want to fly over the coastline and Atlantic Ocean (absolutely gorgeous views on a nice sunny day).
JUst thought: Seneca 1 available (dual only) at
www.sunstateaviation.com in Kissimmee - e.mail Mike Camelin
[email protected] ($330 an hour dual).