Five days works especially well in Central Vietnam because Da Nang, Hoi An and Ba Na Hills sit close enough together to avoid wasting time on internal flights.
Beach & city introduction
Arrive in Da Nang, spend time around My Khe Beach and the Han River, and keep the first day deliberately easy.
Ba Na Hills & Golden Bridge
Use a full or half day for Ba Na Hills and the Golden Bridge, returning to Da Nang for dinner.
Ancient Town at sunset
Transfer to Hoi An, explore the Ancient Town slowly and stay into the evening when the lantern atmosphere becomes part of the experience.
Countryside, food & beach
Cycle or visit the countryside, try local dishes such as cao lầu, then add An Bang Beach if the weather suits.
Flexible Central Vietnam morning
Return toward Da Nang for departure, using spare time for Marble Mountains, cafés or the beach depending on flight time.