Thap Ba Hot Spring Center Address: 25 Ngoc Son, Son Mountain Tel: 3834 939 Do you think hot muddy water might be your thing? Thap Ba Hot Spring Center is one of the most fun experiences on offer here. For around ₫200,000 you can sit in a wooden bathtub full of hot thermal mud, or for around ₫90,000 per person you can slop around with a group of friends in a larger pool. The centre also has private mineral baths and a large outdoor heated swimming pool complete with thermal waterfalls (free with a mud or mineral bath).