If you are picking up your rental car at the terminal:
Follow the signs for the SOUTH EXIT which will lead you to 417 South. Continue on 417 (there will be 2 $1 tolls) to exit 6 (Epcot/Downtown Disney/International Dr) and continue straight ahead (thru 3 traffic lights) approximately 2-3 miles. *Once on Disney property (after you go under the Disney "welcome" archway) take the 1st exit (downtown Disney) and stay in the left lane, turning left at the light onto Buena Vista Dr. At the next light turn left into the Bonnet Creek Resort. You could also take the 2nd exit after you get onto Disney property but then you would need to move over across 3 lanes to turn into the resort which can sometimes be difficult.
If picking up the car from an off-airport location:
Follow the instructions from your rental car company to get onto SR-528 West toward Disney. Continue all the way to the end and exit onto I-4 West. Continue approximately 5 miles to Exit 67 (Epcot/Downtown Disney) and proceed onto Disney property then follow the above directions startinf from the asterisk.