Hi Jess,
You must be so excited about your upcoming trip!
Disney's Caribbean Beach Resort is a beautiful tropical lakeside paradise and is in a great location near to Epcot, Disney's Hollywood Studios and Downtown Disney.
It is a large resort with all resort guest rooms arranged into 6 villages:- Trinidad North, Trinidad South, Martinique, Barbados, Aruba and Jamaica. Each village has its own pool, white sand beach with hammocks and playground, laundry facilities, bus stop and parking area.
The hub of the resort is Old Port Royale which features the main pool, water slide, bicycle and boat rentals, games arcade, shops, food court and sit down restaurant.
Buses to and from the theme parks and Downtown Disney make stops at Old Port Royale and at all of the 6 villages. Some buses begin the loop at Martinique and continue to Old Port Royale, Trinidad North, Trinidad South, Jamaica, Aruba, and finally Barbados before exiting the resort. Other buses begin at Jamaica and continue to Aruba, Barbados, Martinique, Old Port Royale, Trinidad North, and Trinidad South.
I wouldn't worry about this too much as this is what happens at many large resorts. We stayed at Disney's Old Key West resort in 2009 which had a similar situation and it was not an issue for us at all.
If you wish to be close to Old Port Royale, I would suggest that you request a room in either Martinique (in order of closeness: buildings 26, 25, 24) or Trinidad North (buildings 31, 32 & 33)
I hope that this has helped and wish you a magical holiday!