Are the Great wall, Summer Palace, and Beijing Zoo open during 10-14 March?

Hi!

We will be traveling to beijing on 10-14 March 2010. I understand that it will still be winter at that time, are the tourist spots like the great wall, summer palace, and beijing zoo open during this time?

We will also be staying at days inn forbidden city. Is this hotel walking distance from Tianamen square, forbidden city, and temple of heaven?

How much would it cost if we rent a taxi for our group to go to great wall, sacred way, and summer palace?

Thanks!