i suggest you stay where you are. north or south coast is giving yourself too much choice. it ain't nice to travel across entire country at 9 months of pregnancy.
in POP any clinic will do: brugal, bournigal, hernandez. they all have decent doctors and decent service but forget about all western modern rubbish about water birth, breathing and holding hubby's hand. dominican hospitals are very straightforward. most will simply perform cesarean as it is easier and more expensive. none will allow you to have company, you will be most likely in quirofano anyway.
SD probably offers more but i don't live there so i cannot offer any suggestions.