Wow, a whole month! Lucky you!
We don't spend all our days at the parks (it's my DM's requirement) and check out "the real Florida" each trip.
Some of the beaches we've visited are: Sanibel Island, Anna Marie Island, Honeymoon Island, The Keys, Siesta Key, and a beach on the East coast that was near Kennedy Center. Stayed at Key Largo for a few days back in 1998.
I really liked Sanibel but it is pretty far from Orlando. We stayed 2 nights in Sarasota and visited Anna Marie on the way down, Sanibel the next day, and Siesta Key for a short visit the day we left.
Last year we visited Honeymoon Island (outside of Tampa) and we'll either go back this year or check out St. Pete Beach or Clearwater Beach.
The beaches on the East Coast have a lot more waves than the West Coast. We prefer the less wavy beaches.
We've also visited the Crystal River area and saw Manatees. Also saw Manatees at the St. John River. Checked out the Merrit Island Refuge-saw Manatees there as well.
There are some nice state parks in Florida. Last year we revisited Rainbow Springs and it's very nice.
We've also driven a "U Drive Airboat" in the Kissimee area. Took a short helicopter flight over WDW. (again in Kissimmee).
We've never picked oranges, check out this site for u picks
http://www.pickyourown.org/FLeastcentral.htm
And of course there are many theme parks around. Personally if I was there for a month I would spend many days the TL and BB. Also, I would splurge and do Discovery Cove which inc. 7 days at either Busch Gardens or Sea World. For and extra $70 you can get 14 days at both as well as Aquatica.
Since you have time you could drive down and check out the Everglades.
Here's a website with Florida Fairs listed
http://goflorida.about.com/od/attractions/a/fairs.htm
There's a lot to do in Florida. Search around on the net and you'll find plenty to do.
Have fun!