First, make sure of the Disney Quest hours. You might have time to check in first. I would rather get to DQ early and then check into the YC, because it gets crowded there after lunch. Maybe if you've had enough "virtual reality" you could head to YC right when check-in starts. The only advantage to checking in early is when you can't get back to the resort until it's very late. That's when you might not get a great room.