Just go to whichever bus stop is most convenient to your room, or the one near the food court if you're going from breakfast directly to the parks.
Buses can enter the CBR property from two different places, so they'll stop at either Jamaica or Martinique first. (I believe most routes start at Jamaica)
They've also apparently added a stop at the Custom House (front desk) since my last visit, though I'm not sure where on the loops that is worked in.
And because of these two different starting points for the lop around the resort, you can always use the buses to get from one place to another. Just ask a bus driver if they'll be going to your destination before getting on. (They also sometimes run an "Internal" bus route)
If you'll be staying in a Preferred location room, I suggest Martinique 25 or 26, which is right next to the food court, and also right next to the food court's bus stop. (Even closer than the Martinique village bus stop)
-Rob