If you're in eastern Jeollanam-do I'd recommend heading to Suncheon, a city of 270,000 and my home for two years. There's a stream that runs through town, and it's lined with rapeseed flowers (유채꽃), forsythia (개나리) and cherry blossoms (벚꽃). Here are some pictures I've taken in years past:
Those are taken from the four posts I've done on Suncheon's spring flowers:
* April 5, 2009: Beautiful flowers in Suncheon.
* April 3, 2009: Flowers n'at last weekend in Suncheon
* March 13, 2009: Cherry blossoms in Suncheon
* March 30, 2008: Beautiful day in the neighborhood.
That stream, 동천, runs all the way to Suncheon Bay, and since last fall you've been able to rent a bicycle to go from town to the bay. There are 100 bikes distributed among 5 stations, and by clicking on the stations on the homepage you can check availability.