If you take the bus- your choice would be to go to AK then walk over to AKL. Providing that buses are still running to AK - depending on the time of year & the time that you are trying to get over to AKL the buses may not be running at that time (I think they run for 1 hour after park closing time). In my opinion the easiest (certainly not the least expensive) way to go resort to resort is via cab. From POR to AKL it will be close to $20 - you are almost going from one side to the other. No hassle - door-to-door, it's worth to me.
I'm sure someone will provide you a post that can give you a way to bus to TTC then transfer to an AKL bus or something like that - maybe it's bus to MGM then get on a bus to AKL, or maybe its bus to....... You get the picture, right? Too much for my feeble mind to handle - take the cab & leave the driving to them.