how to get from hong kong airport to sunon hotel shenzhen dongmen district?

You can take a ferry from HK shy pier to Shekou port. The fare for the economical class cabin is HKD220 for adults and HKD 130 for kids between 0-5 years old. The ferry ride is about 30 mins. Upon arrival, you can take the subway Shekou Line to Window of the World, where you can transfer to Luobao Line to Laojie Station. Take the Exit E and walk about 260 yards, you will reach the hotel.

My suggestion is to take a direct cross-border coach to Luohu. You may reach in two hours. Then you need two taxis to the destination and it costs CNY10 for each.