A lovely 50km flat ride along the river and you can take a train from Miryang back to Busan at 18:20 with a bicycle rack.
I've cycled up the Nakdong river many times, but this time I decided to veer off the dedicated cycled route and try to make my own way to the town of Miryang. However to my great surprise I found a dedicated cycling path all the way to Miryang. What was even more surprising is that this path is not even indicated on Naver maps, it's completely empty of other people and all between the farmlands. This was literally the perfect 50km if you just want to cruise along with the wind in your hair or try to reach top speeds. ( I chose to cruise.)
Of course you can cycle to Miryang and back for a perfect 100 km.
Elevation: very flat
Surface: cycling road all the way
Transport to Yangsan: Take the subway to Yangsan station or take a bus to Yangsan
Transport from Miryang: Take a train to Busan station (18:20 only train with cycle racks) or take a bus to Sasang.
Any information about cycling in South Korea.