Hi, Greg!
Your best bet is to start at the
official Disney Web site. There, you will find the most current - and accurate - information regarding the Parks, Resorts, and "practicalities" - like
transportation.
Admittedly, the site doesn't provide the specific routes that each bus follows. This is because the routes are variable and subject to change without notice, based on crowd levels, season, etc.
But lots of devoted Disney fans have made a science out of tracking, fact-checking, and generating route maps in picture and in text. These superfans post on sites like my favorite: AllEarsNet.com. I remind you, however, that while rich in content and information, these sites are not affiliated with or sponsored by Disney, so neither the accuracy nor "freshness" of the information is not a guarantee.
Finally, you might want to give a call to (407) W-DISNEY. The Cast Members at the Walt Disney Travel Company are delightful and oh-so-patient when addressing Guest questions (and trust me, I know!). If you have your list of start points and destinations prepared, it's a reasonably sure bet that your Cast member will be able to help you create the best travel approach to maximize your time.
Have a wonderful trip!
See you later, celebrator,
-Deborah B.