trip to Beijing

1. Which is better to take from the Capital Int'l Airport to Novotel Xinqiao for 4 people at past midnight - shuttle bus to the Railway then taxi to hotel or taxi straight from airport to hotel? How long is the travel time?

2. Where can we buy the transportation card ("yakitong")which can be used for both public bus and metro subway? Is it available at the airport? Is the refundable deposit still CNY20? Do we need to buy 1 for each person?

3. How much is the round trip cable car ride at the Badaling Great Wall? Which part of the wall should we take to see the red maple leaves?

Thank you in advance.