 The best known of these hotel-spas are the famous Ixtapan Spa Hotel and Golf Resort, Marriott Ixtapan de la Sal, Hotel Rancho San Diego Grand Spa Resort.These resorts offer guests baths in volcanically-heated waters, massages, beauty treatments and other services.It is also the home of the Parque Acuático Ixtapan, a water park with thermal spring spa, a children's area, a family area and an area dedicated to "extreme" water rides.