Ninh Binh Itinerary 4 days is now your major concern after choosing a suitable desired duration for your stay.
You, as an international visitor, may find the destination rather unfamiliar. Arranging a proper plan which leads you to amazing spots to discover a new nation is a challenge. Then I guess some recommendation from a local buddy like me will help!
At the end of April and early May, the weather is not too hot so it is appropriate to visit Ninh Binh, you can climb to mountain, explore a lot of caves … The schedule is listed here for visitors