Taxi and High Speed Train Ticket

1. I'll be arriving at Hangzhou airport quite late (11 March) - 10.30 pm. As it'll be my first time there, how can I get a taxi to my hotel in Jinjiang Metropolo Hangzhou East Station? How much approximately is the taxi fare? Do the taxi drivers accept cash as I do not have cashless payment apps.

2. If I'm not rushing for time, can I buy a high-speed train ticket from Hangzhou East to Suzhou on 12 March over the counter? Do you think tickets will still be available? I tried to register for 12306 and other apps but failed to do so, as most require a Chinese mobile number.

3. Can I buy the metro card from the counter? Do they accept cash?

4. What's the weather like in Hangzhou from 11 - 15 March?

Many thanks in advance for anyone who can help with my enquiries.