Seochonje Sushi 100 serves conveyor-belt sushi inside the theme park on Sumokwon-gil at Halla Arboretum in Jeju. Menu items not on the rail, including tuna belly and flounder fin sushi, can be ordered separately. It is open from 11:30 a.m. to 9 p.m. and closed every Tuesday. Arriving early avoids a wait.