The first day I would build
Give the city one clear route before adding extras.
- Start with Bock Casemates and Chemin de la Corniche while energy is high.
- Use Grund as the natural reset instead of crossing town too early.
the easier plan is Old Town and Bock first, Corniche and Grund afterward, Kirchberg 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 Pfaffenthal lift just because it looked close on a map.