The first day I would build
Give the city one clear route before adding extras.
- Start with Old Town and Bratislava Castle while energy is high.
- Use Blue Church as the natural reset instead of crossing town too early.
the easier plan is Old Town and Castle first, riverfront or Devin 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 Devin Castle just because it looked close on a map.