There shouldn't be any stress involved. The boats will be running at least 30 mins prior to park opening. But, that may not get you to the BC in time for 9:00. Why? If the first boat leaves the YC/BC dock at 8:35, it will get to DHS about 8:50ish, then it has to unload and make it's way back to the S/D, then YC/BC....which will take 15 mins. Past your ADR time. But....you can still drive to DHS, leave your car, and then walk over to YC/BC if there is no boat there. If it's an EMH morning the boats will be running earlier. Or, they could start running a bit earlier for any reason..you just don't know. If there isn't a boat at the dock, or coming in, by 8:35, you can walk. It's a very easy, pleasant walk...takes under 18 mins. Walk to the end of the walkway, go left up the hill to the bridge, go right and down the bridge towards YC. Walk to the entrance of BC, a very short walk from the YC. I've actually made the walk in 13 mins, but I was really cranking!!! Not very relaxing at all!