Take a cruise to Tianjin in August and seek a half-day tour guide.

I don't know what time the cruise ship will turn next day. If it's in the morning, I'll stay in Tanggu and take a taxi directly in the morning.

If you are after noon, you can consider living in the city, near the Haihe River, visiting Cultural Street during the day, and taking a cruise at night. If you live in the city, you can take a taxi to tianjin railway station and take Line 9 to Tanggu the next morning, and then take a taxi.

Breakfast depends on your personal taste and the environment near the hotel. I usually go to any city for breakfast in a hotel, and most of them are buffet breakfasts. First, it saves time, and second, the taste will not change much.