This doesn't make sense, sorry
You post "HOw to get from Punta Cana to Saman?" This has been covered 'ad nausium' , so do a SEARCH.
Then the body of your post asks for info on towns in the South.
The "SOUTH" of the DR is generally considered to be the area from Santo Domingo to the West-->>Ban?, Azua, Barahona
The EAST is considered to the the area to the EAST of Santo Domingo-->> San Pedro de Macoris, La Romana, Higuey, B?varo, Punta Cana.
SAMAN? is on the North coast.
NOW: WHERE do you want to go???
HB