Don't go back to "your" resort unless it makes geographic sense to do so. For instance, if you are at AKL, it would be REALLY out of the way to take a bus from MK to AKL and then a bus from AKL to DTD.
You could walk or monorail to Contemporary and then take the bus from there. Buses to WL, FW, POFQ would all be okey-dokie, too. If you're in a walking mood, you can take a bus to SSR and then walk (or take the boat) from there to DTD.
If you're in the mood for walking as well as seeing a different resort and you're NOT in a rush, take the bus from MK to POFQ, then walk through POFQ to the dock (it's about a 3 minute walk from the bus stop) and wait for the boat going to DTD. A slow process overall, but interesting.