We just got back from CBR. To my knowledge, if you booked a preferred room, it will be in the buildings in Martinique or Trinidad North that are closest to OPR. The rooms in the villages across the lake, like Aruba and Jamaica, aren't preferred, but they do cost less per night. That being said, we stayed in Jamaica building 45, right at the end of the walkway on the other side of the lake. It was a very short and pleasant walk across the little island to OPR, and I didn't regard it as any sort of a hardship. We found it to be very quiet on that side, with the added bonus of being able to see the Wishes and Illuminations fireworks from the balconies of the buildings that face the road. Having stayed there, I wouldn't pay the extra money to stay in Martinique or Trinidad North.