3 Best Sights in Jeju-si, Jeju-do

Like most of the beaches on Jeju's northern coast, you'll find plenty of white sand sloping gently into crystal clear water, along with plenty of cafes, restaurants, and other amenities. What really sets Hamdeok Beach apart, though, is that it's right next to a sizable volcanic cone, Seoubong. It's a short hike to the top, where you'll find great views over the coast. The hill is covered in bright yellow canola blossoms in spring and golden cosmos flowers in autumn, too. The beach is just 30 minutes from Jeju International Airport, making it one of the island's most accessible seaside destinations. Amenities: food and drink; lifeguards; showers; toilets. Best for: sunset; swimming; walking.

Described as "a place where love-oriented art and eroticism meet," this theme sculpture park provides some intriguing—albeit daring—insights into the art of love making. Given Korea's relative conservatism this venue may come as a surprise for some. Throughout the grounds are 140 large sculptures and monuments. This is strictly an adult activity; keep the kids at home.

Designated as a UNESCO World Heritage Site, this cave was created many millennia ago when the island's volcano was still active. Manjanggul is the largest lava cave on the island, stretching for about 4.5 miles, though less than a mile is open to the public. The path into the cave is well lit but it still feels dark and spooky. Manjanggul is part of the larger, 300,000-year-old Geomun Oreum lava tube system and is packed stalactites, stalagmites, and a lava column—it's a photographer's playground.