The first day I would build
Give the city one river route and one cultural stop instead of chasing scattered pins.
- Start with Tianjin Eye or the Haihe river when you want the city to make sense.
- Use Ancient Culture Street only if shopping, snacks, or tea belongs in the day.
- Keep Goubuli or Mingliu Tea House close to the same side of town.
Tianjin becomes clearer when the Haihe river is the spine of the day. The Tianjin Eye is useful because it gives you one obvious landmark, one bridge-side orientation point, and a reason to keep the route compact.
Ancient Culture Street is better as a purposeful stop than a vague old-town browse. If you want crafts, snacks, tea, or a show connection, it fits. If not, do not force it just because the name sounds important.