The boat transportation to and from DTD from POR and POFQ runs from 11:00 am to 11:00 pm. From POR, you have to transfer to a parks bus and then transfer to a resort bus to get back.
The buses run from 9:00 am to midnight. They are situated not too far behind Rainforest Cafe. We were there just last November and I was pleasantly pleased how well the buses were running at DTD. There were two attendants there at all times, radioing dispatch and telling them which resort buses were needed. Several times, I think we waited maybe eight minutes or so.
It was a bit chilly to ride the water taxi late in the evening.