Can I go to the lawn and beach in Arcadia without staying in a hotel?

Yes. According to China Tourism Network.

1. If you don’t stay at the Arcadia Hotel, you can also go to its private beach and lawn. These facilities are open to all guests and residents. However, non-residents are required to purchase admission to the beach and lawns.

2. Non-residents can go to Arcadia’s reception or concierge’s office to purchase tickets to the beach and lawn. Tickets can also be purchased at local tourist agencies or online, but Arcadia recommends going directly to the hotel or concierge to ensure the ticket is authentic.