Ah, on a recent trip to China I was seated next to a businessman from Brisbane who had a factory in Tianjin. He said it wasn't too bad a place to spend time in, and that it was modernizing quickly. He manufactured market stalls if I recall correctly.
You'll be a bit short on geocaches in the area though. You had better take some books to read
English bookstores can be few and far between. I've only seen one in Beijing, and that was in the consulate district where it could be expected to be found.