Excellent job, Rose. Your writing is getting very good :)

Nowadays Koreans are richer than in the past.
If people have time, they like to go out and do activities.
In the spring, it is warm and clear, and people like to go hiking.
Most cities in Korea have convenient bike lanes.
Families, as well as professional bikers, enjoy bike riding/riding bikes.
In the summer, it is hot and muggy.
People seek places to cool down, so they go to the beach(Haeundae in Pusan) to enjoy summer sports like swimming and surfing.
In the fall, the mountains are beautiful. People enjoy mountain climbing and looking at the autumn leaves.
In the winter, it is very cold and windy, but people enjoy winter sports like ice skating, skiing, and sledding.