Which subway I should take from Marriot to Tianjin Eye?

Is your hotel located at No.16, Binshui Street, Hexi District?
If yes, no direct subway can take you to the destination. So it's suggested to take bus no. 675 at Binshuiqiao Station, get off at Dongmalu Station. After that, walk north around 0.6 miles.
Or you can also take a taxi directly. The cab fare is CNY 20 to 30 in the day time.