According to the 2002 Passporter, the non smoking rooms at CSR are as follows:
building 1 Casitas---floors 1 and 2
building 2 Casitas--all
building 3 Casitas--all
building 4 Casitas--all
building 5 Casitas--all
building 6A Rancheros--all
building 6B Rancheros--all
building 7A Rancheros--all
building 7B Rancheros--all
building 8A Cabanas--all
building 8B Cabanas--all
building 9B Cabanas--all
buildings 1 and 9B are closest to El Centro...but only in building 1 can you get to El Centro without going outside.
buildings 6A, 6B, 7B, and 8A are closest to the Dig Site Pool
buildings 4, 7A&B and 8B are closest to the quiet pools and laundry.
buildings 4 and 5 are the most remote.
Hope this helps!