The first day I would build
Give the city one clear route before adding extras.
- Start with Cristo de la Concordia and La Cancha while energy is high.
- Use Plaza 14 de Septiembre as the natural reset instead of crossing town too early.
the easier plan is Cristo viewpoint first, city center and La Cancha afterward, Tunari as a separate outdoor day. That keeps the day readable instead of turning every good name into a separate detour.
I would rather leave one place for tomorrow than drag a tired route through Recoleta just because it looked close on a map.