Transportation in Xian

My uncle and aunty are going to visit Xian in August, they only stay for 2 nights 3 days, they just wondering:
1. how far from the Xian railway station to Grand Metro Park Hotel? what would the cost of the taxi fare? It is easy for them to get taxi early in the morning like 7:15 am upon arrival?
2. what sightseeing areas around Grand Metro Park Hotel? Walking distance?
3. How far from the hotel to the Mount Hua?
any suggestions?
Thank you.