When Aerolineas suspended flights awhile back my husband had to take a bus from Neuquen to Bahia Blanca. So I assume you can take a bus Bariloche -- Neuquen. From Neuquen not sure if you can get a direct to Mar del Plata or if they will make you go Bahia Blanca, Mar del. The odds of getting a bus to Pinamar from Bariloche are a about 0. From Neuquen, about 0. From Bahia Blanca, slightly better. You'll more than likely have to go to Mar del Plata before you can get to Pinamar.