Subway tickets are 2 yuan, and to make a full circle on the circle line takes about 40 minutes, and from Xi Dan to Pingguo Yuan takes about 30 minutes. You'd better want to consider buying a like if you are in Beijing for an extended period of time. Biking around Beijing is a fun way to get to know the city. Also, there are rarely bike jams. There are all different price ranges for bikes.
Mountain bikes are cool, but actually unnecessary as Beijing is an extremely flat city.
Bicycles can be rented from large repair shops. When you hear the word rickshaw, you may think of the two-wheeled bicycles guys with long braids that you see in old movies. But today, rickshaws are actually three-wheeled bicycles often driven by old, retired men. There are fleets of them circling around the Tian'anmen Square area, and they are always willing to take passengers. It is nice to take a ride around the Square in the evening, but if you do, make sure you come to a price agreement first.