Heoshimcheong Spa
Said to be the the largest natural hot spring spa in all of Asia, this mammoth, pavilion-like complex is the granddaddy of soaking in Busan. There are more than 40 different kinds of baths available, including large open areas, cozy grottos, green tea and waterfall baths, as well outdoor pools. These range in temperature from geyser hot to glacially cold, so if one pool doesn't suit your taste, you're sure to find a perfect fit the next one over.
The Heoshimcheong also includes a unisex jjimjilbang (Korean sauna) with heated rooms and relaxation areas, along with a nightclub, hotel, banquet rooms, as well a massive German-style hof where they brew beer their own beer and serve it up with sausages and pretzels. There's also a house band that rocks the roof off the place seven nights a week.
