Volcano & coast loops.
Best time: May–Oct
Budget: $40-80/day
Top fact: Jeju Island is home to Hallasan, South Korea's highest mountain, standing at 1,947 meters (6,388 feet) and forming a shield volcano at its core.
View Jeju Island →Culture meets tech.
Best time: Apr–Jun, Sep–Oct
Budget: $40-80/day
Top fact: Seoul is home to over 10 million residents, making it one of the most densely populated cities in the world.
View Seoul →Both in South Korea — compare vibe, budget, and best season.