Hoi An - Getting There & Getting Around

There is a regular bus service to/from Danang but most peole take on of the minibuses that run between Hoi An and Danang, Hue or Nha Trang. Most hotels will be able to arrange a ticket. Hotels in Danang will be able to organise a car and driver to take you on a day trip to Hoi An, stopping at Marble Mountains on the way.
Hoi An is quite a small place so you can walk everywhere quite easily. Hiring a rowboat with oarsperson is a pleasant way to spend a couple of hours, or you can take a motorised launch to the nearby My Son area.
Distances

Quang Nam Province is located in the middle of Vietnam, 860km from Hanoi, 947km from Ho Chi Minh City, and 108km from Hue City. The province is on the National Highway 1A, the South - North railway and on the route of Danang - Quang Nam - Kon Tum - Gia Lai - Dak Lak - Dak Nong - Binh Phuoc. Hoi An is 32km from Danang and can be reached by car, bus or minibus.

http://www.howtotravelvietnam.net/English/Hoian_Howtogetthere_