I can't think of any real tricks, other than just going to your bus stop and waiting. Fortunately you shouldn't have to wait long. CBR probably has the best bus service of all the resorts, except maybe All Stars.
The primary route, and most common, is to enter through the main entrance. Stop at Martinique, Calypso, Trinidad North, Trinidad South, Jamaica, Aruba and Barbados, then exit through the main entrance.
There is an alternate route added during peak periods. Buses enter the auxillary entrance on the west side and stop at Jamaica, Aruba, Barbados, Martinique, Calypso, Trinidad North and Trinidad South. They exit back through the Auxilliary gate. This helps to give guests at Jamaica, Aruba and Barbados a good chance for a seat.
The Internal buses are sort of an illusion. Buses from Downtown Disney and MGM enter through the Aux gate and circle the resort starting with Jamaica. Their illuminated sign shows "Internal". Then these buses go around again, this time showing "Downtown Disney" or "MGM Studios" before leaving via the Aux gate. This leaves the impression that they have several internal buses that just go around and around the resort. They don't.
