请给出一份北京三日游的详细行程安排，必须包括每一天的具体活动，以及行车或乘坐的交通方式。比如，用动车、地铁或者出租车等。
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Day 1:
- Morning: Depart from your city by high-speed train to Beijing.
- Afternoon: Arrive in Beijing and check into your hotel. Take a taxi to Tiananmen Square and the Forbidden City.
- Evening: Enjoy a traditional Beijing Duck dinner at a local restaurant. Take a taxi back to the hotel.

Day 2:
- Morning: Take a subway to the Temple of Heaven.
- Afternoon: Visit the Summer Palace, accessible by bus or taxi.
- Evening: Stroll around Wangfujing Street for shopping and snacks. Return to the hotel by subway.

Day 3:
- Morning: Take a taxi to the Great Wall at Mutianyu section.
- Afternoon: Return to the city and visit the Lama Temple by taxi.
- Evening: Take a subway to Sanlitun for a nightlife experience. Return to the hotel by subway.

Please note that the above itinerary assumes you are starting from outside Beijing. If you are already in Beijing, the high-speed train portion can be omitted.
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