Having just returned from Caribbean Beach, most busses enter from Victory Way and cycle through: Jamaica, Aruba, Barbados, Martinique, Old Port Royale, Trinidad North, Trinidad South.
Very rarely the bus used the main entrance (but did sometimes): Martinique, Old Port Royale, Trinidad North, Trinidad South, Jamaica, Aruba, Barbados
The parks were empty last week yet busses were very frequent at the Resort. It's really just luck. The transportation system works well. Usually its great, sometimes its poor. And it doesn't matter which Resort you are at.
If you have paid for a Water View, make sure you request a Barefoot Bay Lake View. Those views are preferred over pool views. Excellent pool views are in ARUBA buildings 51 and 52.