This is from my previous post in this same thread.
This is the information. Hope it helps.
Tourism
Allowed to entry through checkpoint: Hon Gai Seaport (Hanoi, Ha Long Bay)
Exit through checkpoint: Vung Tau Seaport (Ho Chi Minh, Phu My)
Intended date of entry: date when your cruise is in Vietnam .
Intended temporary residential address in Viet Nam:
Celebrity Solstice - 6A Lê Thánh Tông, Hồng Gai, Thành phố Hạ Long, Quảng Ninh 01106, Vietnam
City/Province: Quang Ninh
Some had simply put down Solstice Cruise ship and it was accepted.