A great way to explore Udo is following the 11.3km Jeju Olle Trail Rte 1-1. The moderately challenging trail runs past the island's two ports and main sites, including Hongjodangoe Haebin beach. There are plenty of minbak and guesthouses here, as well as places to eat. The whole course takes four to five hours, starting and finishing at Cheonjin Port.