Before booking, just do a quick check to see if package prices are cheaper for you than booking hotel and buying tickets separately. Just to make SURE.
I like using mapmyrun for Disney. I recently did it for the paths we took on our DLH trip, and I'd already done some for PPH. using the best guestimate/approximation for the path we took (going through DTD is tough b/c there's no such thing as a straight line in there)....
From Frontier Tower to the center of the esplanade via DTD: .55 mile.
From Frontier Tower, going out the back/side of it, along the sidewalk to the crosswalk and crossing over to the Grand, going through the Grand's path to DTD, and to the center of the esplanade... .55 mile.
DLH to the monorail (and I think I used the DTD Side of Adventure tower for this), .09 mile. BUT the monorail isn't totally helpful for Magic Morning unless you're wanting to ride Nemo for MM, IMO. And it's not always open. Going BACK to the DLH, however, assuming you're near the monorail and the line isn't awful, is lovely on the monorail.
PPH to the center of the esplanade following Disney's signs (which takes you out the back, past DLH, all the way through DTD), .63 mile.
PPH out the FRONT and through the Grand to the center of the esplanade, .45 mile.
(and for fun, Tropicana to the center of the esplanade, .29 mile)