Gamcheon Culture Village, known as the Machu Picchu of Busan, features stairs and narrow alleys. You absolutely cannot bring suitcases, so you must leave them at Toseong Station or Busan Station.
There are small lockers next to the village information office, but they fill up quickly. It's most efficient to use lockers at Toseong Station on Line 1 and take the bus to the village.