The cheapest transportation to go to DaNang and reverse. From DN to HA just only 30km, you can also rent a bike but who guesses what will happen in the rainy days? The yellow bus number 1 is famous for every local.
If you need a transfer, this one you might consider. maybe it's not the fastest, but it's the cheapest. The price for 1 way is printed on the body of the bus, you might take a photo of it in case you need to show. Please do not ask them how much does it cost. The price excluded big luggage.
Hold 20.000 VND in your hand, be confident, make sure you show them the face like "oh, I know how much, I go by this all the time".
Mon-Su: 05:30-17:30