1)It is hot and often rains in Tianjin in summer, so rain wear is a requisite. Also, the temperature difference between day and night can be big, so it is best to keep warm so as not getting a cold.It is very hot in Beijing and it is alike the weather in Tianjin.
2)You'd better take some summer clothes,such as short pants, T-shirts, skirts and sandals. Long-sleeved shirts can be prepared for the nights.
3)You can take T-train in Tianjin Train Station to Beijing.The first class seat is 69 yuan, and the second class seat is 58 yuan.
4)Walk to Chongwenmen and take subway Line 2. Get off at Dongzhimen and then take bus 614 and get off at Hutongdong Street. Walk about 280m, you will get the hotel. It will just coast you about 3 yuan.
5) First walk to Wangjing Hospital and take Bus 656. Alight at Jianxiangqiaodong and take bus 919. Get off at Badaling and you will arrive at the Great Wall.
6)You can go to Hongqiao Pearl Market and Xiushui (Silk) Street to buy these things.