1. You are in Hanoi
Simply ask the cruise agent when you could get to the next trip then check your booking hotel to know if you can stay longer in Hanoi. If it allows then it means you have some more days to dig deeper Hanoi area. The hotel can arrange the room for you or if it is fully booked, they can also contact other hotel for you. In case that you cannot wait, the agent will pay you back the full budget and you can choose to visit somewhere else such as Ninh Binh, Sapa or Mai Chau.