Dodae Bibigol Sky Valley is an observation deck near Mukho Station in Donghae where visitors look down over the East Sea. It has a glass-floored skywalk, sky cycle, and giant slide, and a cafe sells coffee and Dodae Bibi ice cream. You can take an elevator from the Haerang Observatory side or walk up from the Mukho Lighthouse side along Nongol Damgil. Tickets allow re-entry within three hours, and the hill is steep with limited parking.