The first day I would build
Give the city one clear route before adding extras.
- Start with Novosibirsk Opera and Ballet Theatre and Lenin Square while energy is high.
- Use Ob River as the natural reset instead of crossing town too early.
the easier plan is Lenin Square and Opera House first, Ob River or museum next, zoo or Akademgorodok separately. 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 Akademgorodok just because it looked close on a map.