You know, every time I go to the Airport, I take a different route. But whether you take I4 or 417, make sure to get out at the Epcot/Downtown Disney exit. That will put you onto 536. Once you go under the Disney arches, there will be an immediate exit. Take it. At the traffic light, go straight across Buena Vista Drive, and onto Bonnet Creek. Go through another traffic light. The next traffic light will be Community Drive, and you'll see a sign for Old Key West. Take that Right.
When exiting out of OKW, take a RIGHT onto Community Drive. You'll drive past Saratoga Springs, and come to a stop sign. Take a RIGHT. You'll come to the intersection of Buena Vista Drive and Hotel Plaza. Take a LEFT. The next MAJOR intersection will be 535. Take a left for Steak & Shake, and a right for Bennegans. Both will be on your right hand side, and 1/2mi - 1mi away.
To return, reverse the directions. Turn into Hotel Plaza Blvd, and take a RIGHT onto Buena Vista Drive at the new interchange. Make sure to look carefully for that Left onto Community Drive. It may be marked with a Saratoga Springs sign, but not sure if it is yet.