What Curtis said.
Valdes is a must, as is a whale watching trip from Pto Pyramides. If you have time call in on Oscar Knecht who runs the Viedma community. There's a lovely campsite there on the banks of the river, well worth a day or two. Utterly unmissable is "La Posta del Viajero en Moto" at Mendoza 685 in Azul. It's on your way to Bs As on Ruta Tres. Jorge (who runs it), his family and friends are fantastic hosts; a party is practically guaranteed. Last, but not least, get in touch with Sandra and Javier Kaper of the Bs As community. They also have a place for moto travellers to stay, are lovely people and can give you loads of help of all kinds.
Apologies if you know all this already.
Enjoy the rest of your trip.