Cuautla’s best-known balneario is the riverside Agua Hedionda. Waterfalls replenish two lake-sized pools with sulfur-scented tepid water. There are small artificial waterfalls, and activities aimed at children. There’s a two-for-one deal on Thursdays. Take an ‘Agua Hedionda’ combi (M$7.5) from Plazuela Revolución del Sur.
Private baths (M$250, 8am to 7pm) are also available.