Easy to answer that Sanya question this mid-December week, Sanya is warm to hot at 25C+, vs cold or snowy in Beijing this week. Rates have not doubled yet for Xmas/NY eve holiday week, or tripled for the CNY chaos week.

But need to leave the JW Dadonghai bay for Yalong bay tomorrow. I know about the China tipping etiquette and threads', had fabulous food, and service here at the EL club lounge, even brought me a special bottle of 15-year-old scotch whiskey when i complained about cheap bourbon. So 7 days X 100 rmb a day, 700 rmb, or about $100 for the week?. seems okay for a mixed staff of 10 people.
I'm, going to put a mix of 50's & 20"s in one 'white' envelope and give it to the EL supervisor with a couple names and say great hospitality, do whatever is proper for her staff.
Then see what happens. Later, ill post hotel trip updates on the Marriott forum.