On the easier said than done side, I think exclusive roads for buses (or whatever the mode of transport is) is the key to success. No matter what it is, it will need rights of way over or under existing roads.
The perception of waiting for transport will always be a challenge, unless you have a people mover or ski lift type of ride as your transport. People will always want direct access to the park of their choice, so connecting through a hub would be a challenge.
For a light rail loop, I'd try to connect POR, DTD, south side of CBR, DHS , AK and the transportation center. I puts the remaining two parks on a rail line, and connects the moderates. It would be a longer loop so not a convenient as the monorail for the premium resorts. Somewhat close enough to a few of the value properties to be valuable. Connects DTD into everything. Considering you'd never really take the full loop at once, and assuming traffic moving in both rotations, you are probably looking at 30 minute movement times as a guess, maybe 45.
pie in the sky idea though.
