Lagos de Colón is a recreation area in the Mexican state of Chiapas, near the Guatemala border. It has streams and lakes with flowing, fresh, clear mountain water for swimming or kayaking. The entrance fee to the area is a mere MXN $25 or about USD $1.25 per person.
The area has shops, restaurants, hotels, and camping areas. We happened to meet a chef who opened a restaurant there, and whose specialty was a fried fish platter that we just had to try. The local fish was fantastic.
We stayed in the tree-shaded parking lot, looking out to one of the lakes. We swam in the cool lakes during the hot afternoon, made a short video of the waterfalls nearby.