Here is a list of destinations you should visit in Da Nang – a beautiful city which is only 30 km from Hoi An. Destinations are listed on the way from Hoi An to Da Nang.
The Marble Mountains (Vietnamese: Ngu Hanh Son)
My Khe Beach
Da Nang Museum of Cham Sculpture
Son Tra Peninsula (Monkey Mountain)
Linh Ung Pagoda (Lady Buddha)
Ba Na Hills
Hai Van Pass
Bach Ma National Park
Google Maps: https://goo.gl/maps/hFVjCN89s2Q2
Note: Bach Ma National Park is located in Thua Thien Hue province (not Da Nang city). But it is not very far from Da Nang (~65 km). So, a tour from Da Nang to visit both Hai Van Pass and Bach Ma National Park is a great idea.