Up the hill from the Thermal pools of El Volcan is a prety little waterfall. If you feel too heated up and need to cool back off this is the place to do it. The water is cold and fresh. I myself pefer to stay warm.
If you go to El Volcan you don't have many choices for food, 1 really, but it's not bad luckely.
The room is smoky, the grill is right inside but the smell of meat cooking over fire always makes me hungry. There is traditional Colombian grilled food, a Sobrebrella steak goes nice with a day at the thermals.