Dahua Hotel is no good, just a four-star hotel. Although it is close to the lake, there is no big lawn. First of all, the West Lake State Guesthouse or Xizi Hotel, both of which are near the lake, have large lawns and the scenery is quite good. It was originally a villa of a prominent family in Hangzhou. After liberation, it only received domestic and foreign leaders, and now it is also open to the outside world. Secondly, Shangri-La should be ok, with a large area and a large lawn with its back to the West Lake, but I don't know if it meets your size standard.