Korean Job Discussion Forums

[Sapa]

I have just been researching where I should spend my vacation this coming week. So far it looks like either going to Mokpo or Busan and using these as a base to explore the coastal areas. Baring in mind it will probably be really busy in both areas, is there anything you can recommend about one or the other?
I know in Mokpo you can get ferries to some of the islands but I imagine they will be crazy busy this time of year. Busan was recommended to me by a colleague, but i don't know much about areas to visit around this city.
All I want really are some nice walking opportunities.