Hello Allen,
I'm a bit late seeing this thread - anyway, the address for the observing field is 16405 Myakka Rd
Go East on Fruitville to the end, hang a right. It swerves around and the entrance is on the left side. There is a log sign with a yellow sign. Not well marked. If you cross a bridge, then you just went past it.
Gate may be locked. combo is 1974. shut gate behind you, and drape the lock & chain to look locked while you are in there.
Be sure to lock it up when you leave, and leave no debris.
I may add, once you drive across the cattle tracks, hang a right. you will see an open field with a short power pole surrounded by concrete pads. That's the spot. Drive on the grass. Park by the pads, avoid driving on the pads please.
There's a restroom at the building within sight (the learning center) if needed.
Call me if you get turned around...
Clear skies.
Sean
(941) 373-5611