Well, that depends if it has to stay inside the park or not! If it did not have to stay inside the park i would make it run to Fort Willderness for easier access to the park. lol.
Anyways,
If I had to expand it, the ride would have mulitiple stops, stopping in Toontown, Fantasyland, Frontearland, and Adventure. The ride would zig-zag through all the rides in the entire park, but would not come close to main street, as it would ruin the look. The ride would have to be renamed and retheamed so it could fit any section of the park. The first stop would be over the far end of the speedway covering both toontown and the Mad Tea Party Area. The second stop would be the old "Skyway to Tomorrowland" Station, covering both Liberty Square and Fantasyland. The ride would stop again near the Country Bear Jamboree. The ride would make it's final stop At the (former) Swiss Family Treehouse, in the sky and you would go up/down on Bamboo Elevators. The ride would then go back and do the whole thing in reverse. Wow! that sounds like fun!!