I recommend you to get a SIM card from one of the three large telco companies:
Make sure to check out the promotions they are running. It might also make sense to buy a second-hand SIM card that is eligible for a menu that is no longer offered.
Each of my two Viettel V90 menus gives me 2 Gigabyte of data per day (!) for 90.000 Dong (3.90 USD) a month.
Depending on where you live you might need one or two things:
An air filter. I recommend the Sqair. It’s inexpensive, silent, effective and beautiful.
Less obvious: A dehumidifier. Humidity goes up to 85 percent. When I realized that there is an issue the backpack and toilet bag in my closet were already covered in mold.
Today my dehumidifier gets eight liters of water out of the air of a 27 square meter studio.
There are some things that I’d say are essential, like Pudong, the French Concession or the Bund. Here some advices which might help you to plan ahead.
You can take Line 2 to Century Park, one of the largest parks in the city. After crossing it you arrive at the Shanghai Science and Technology Market with its large underground fake/tailor market.
Then you walk the whole Century Avenue (or take the metro to save time/energy) to Lujiazui, the area with the highest skyscrapers. You’ll find the Shanghai Tower, the World Financial Center and the Jin Mao Tower as well as the Oriental Pearl Tower and (if you like to go shopping) the Super Brand Mall.
This trip should end with a scenery of the Bund at dawn, seen from Pudong. Preferably at the weekend as I don’t know if it’ll be illuminated during the week. Depending on the time you spend shopping, I think that’ll take half a day to one day.
Xujiahui is a large conglomerate of Electronic Markets in Xuhui District. You can get off, look around, maybe visit a nearby church and then walk Hengshan Lu to Huaihai Lu through the French Concession with its villas and plane-lined alleys. You can continue on the high priced Huaihai Lu to People’s Square. Takes a half to one day. (If you only want to do the French Concession then go to South Shanxi Road and continue from there.)
The art street. Moganshan Lu 50, a former factory, is now home to many artists and galleries. Everytime you go there things have changed, new exhibitions open every week, there are concerts and other events. Especially on Friday/Saturday. I’d advice to go there around lunchtime, visit the galleries, take a dinner somewhere and return for a concert.
Two of the most famous places in Shanghai. Not necessarily the most beautiful ones but definitely members of the “must have seen” category. Half a day should be enough but you can spend much more time in the numberous museums around there. Although not quite as famous as the East Nanjing Road, the West Nanjing Road is, in my opinion, more beautiful. Very elegant and high priced. It leads to Jing’an Temple.
Starting near the Old Town you should walk the Bund up on the riverside to see Pudong and down on the other side to enjoy the buildings. Then you can continue to the Old Town. Should take half a day to one day.
That’s something I highly recommend. See one of the poorer neighbourhoods that are beeing torn down to make place for uniform appartment buildings. In these places you can still see little food markets with living animals (with broken feet…), meat lying around in the sun and things tourists usually don’t see.
A friend adds that there is another interesting place in Hongkou District, Duolun Lu, a street where many famous Chinese writers have lived. Knowledge of Chinese history might be helpful. I haven’t been there yet.
Maybe you also want to visit the Campus of Chinese Universities. Either Tongji, where I studied, or Jiao Tong.
If you’re not afraid of walking:
Here’s a map:
In the evening, you might enjoy the great view over Pudong and Puxi at the Vue Bar in the Hyatt on the Bund.
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