I went to Villa Paranacito twice, actually to a camping in the road to Villa Paranacito. The place is great, really, especially in the summer where you can swim in V. Paranacito river. There, as in every corner of Entre Rios province, you can find huge german immigration from the beginning of the century (in fact, the camping where I went is called Grünewlad, or something like that).
I strongly recommend to go to Ms. Grünewald camping in summer, you can have a great asado, get into the river and even theres a store to buy goods. All, only 150 kms from BsAs.