The first day I would build
Give the city one clear route before adding extras.
- Start with Lyubinsky Avenue and Irtysh embankment while energy is high.
- Use Omsk Drama Theatre as the natural reset instead of crossing town too early.
the easier plan is Lyubinsky Avenue and the Irtysh first, theater, cathedral, or museum afterward. 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 Omsk Fortress just because it looked close on a map.