The first day I would build
Give the city one clear route before adding extras.
- Start with Honme Museum and da Silva Museum while energy is high.
- Use Porto-Novo Lagoon as the natural reset instead of crossing town too early.
the easier plan is Honme Museum and da Silva Museum first, market or Great Mosque nearby, lagoon time when the day softens. 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 local markets just because it looked close on a map.