In the center of Vic Island (just outside of Sleepywood) you can take a boat to Orbis, and them from Orbis to Mu Lung.
Alternatively, and also much quicker, you can choose to instead take a boat to Edelstein, and then from there a boat to Orbis. Difference being that it costs you a very small amount, is a few minutes quicker, and adapts to your schedule.
"I'm gonna match my in game snacking to my real life snacking. Acid. Morphine. Coke. Beer. Vodka." FrooFather on the Fallout New Vegas Diet Plan