As of summer season 2023, Cheongsapo Daritdol Observatory is absolutely free to visit but below maintenance when we visited (so partially open) ??we hope they resolve the cracked panels over the glass walkway ??eek! For anyone on a tighter budget, there are actually many budget accommodations in walking length in https://jeju-weather00100.like-blogs.com/30302046/the-busan-haeundae-trip-해운대고구려-budget-diaries