From Pop turn left (South) at the traffic light at the exit. Turn left at the first light (just before WWS). This will take you to Osceola Parkway Eastbound. Follow this street off-property.
You will pass I-4, the Gaylord Palms Resort, the Greeneway (SR 417), and then a traffic light at Seralago Blvd. The first ramp exit is marked SR-535, Poinciana Blvd, and US 192. It also says it is a 75¢ toll. Take this exit. Note, you must have exact change.
At the Stop Sign at the bottom of the ramp turn left. Cross Under the Osceola Parkway. The road curves to the right and the very first left (after the curve) takes you into the Super Wal-Mart parking lot.
This happens to be the largest Wal-Mart I have ever been into.
Going back, exit the parking lot where you came in. Make a right. Just before you go under the overpass the entrance to Osceola Parkway is a ramp on your right. Note again you must have 75¢ in exact change for the toll.
This will take you back onto WDW and just turn right at the first traffic light on property.