Answer: Desert Hot Springs is famous for its naturally heated mineral waters, which flow from deep aquifers along the San Andreas Fault. Many small boutique resorts and spas in the area draw from these hot mineral springs, offering therapeutic soaking pools that vary in temperature and mineral concentration. While some properties are basic or dated, there are several higher-quality options that provide day passes for visitors seeking a clean, relaxing, and authentic mineral soak experience — without having to book spa services.