Get off the turnpike at I-4. Head toward Orlando.
Get off I-4 at Exit 64-B (hwy 192)
On 192, go to World Dr. (it's the next exit) and turn right in DW
Go all the way to the Magic Kingdom toll booths (stay in the right lanes here)
When you go through you will exit to the right on Vista Blvd.
You should be seeing signs for FW.
The fort will be about a mile down on your left.