I'm from New Zealand, I definitely consider Tandil to be hills. Merlo, San Luis is beautiful, mountainous, lots of trekking etc to be had. The bus trip was overnight so the long distance didn't seem too bad.
How about a few days in Merlo then cross over for a few days in Cordoba at the Oktoberfest?
How about a few days in Merlo then cross over for a few days in Cordoba at the Oktoberfest?