Cycling in Orlando is what got me started back on the path of regular cycling again, about 2 years ago.
I was on holiday in Orlando, at a hotel on I-Drive. I had a rented car, but fancied some cycling while I was there. Rental costs were going to be upwards of $200 for a week, so I visited this shop....
http://orangecycleorlando.com/
They just happened to have a very good condition Specialized Sirrus in their used bikes department for $200, so I decided to buy it and then worry about what to do with it when it came nearer the time for returning home! It was of course a left hand drive version so I had to change the brakes round! Seriously, they have the right hand lever to the back brake, and left to the front

, a switch of the cables sorted that out....
Had a really good time on the bike. As has been said, the roads are not great for cycling around the busy touristy parts of Orlando, but don't be put off. Every major road seems to have a wide footpath suitable for cycling on, and get away from the main roads and you will have a great time exploring around the various lakes and quiet back roads. There are a few purpose built cycle paths too, like our NCN routes. A cheap map from the nearest petrol station will keep you right. Having the car helped too, I could throw the bike into the car in the morning and head out to the country, or Longboat Key where this photo was taken:
Weather wise, yes it will be hot and humid, but being on a bike will help you keep cool by having the air moving. Yes it probably will rain very heavily in the late afternoon during summer but you can set your watch by it and avoid it if you must, but it's warm rain! Slightly more worrying is the lightning that accompanies it if your out and about in the middle of nowhere.
I loved that Sirrus by the end of my holiday and wanted to bring it home. The airline wanted $150 to transport it, and in retrospect I should have just paid up and brought it home. Instead I sold it for $100 so my weeks ownership of the bike had cost me $100. And so began my renewed love affair with cycling, and in particular Specialized. Not long after getting home I bought a Tricross, and more recently added a Secteur to the fleet!