Puerto Tranquilo is a beach and settlement on the shores of Lake General Carrera in the Provincia de Magallanes, Chile. It serves as a primary access point for paddlers seeking to explore the famous Marble Chapels, or Capillas de Marmol, a series of intricate marble caves and formations carved by the lake's waves over thousands of years. The primary paddling activity is a guided kayak tour departing from the shore at Puerto Tranquilo, which provides direct access to these geological features. The tours are conducted in small groups and include a safety briefing. The paddling route from Puerto Tranquilo allows close-up views of the Marble Chapels, the Catedral, and various cave areas. The overall experience is one of intimate access to a unique natural spectacle, where sunlight reflecting off the deep blue lake water illuminates the multicolored marble. The lake is large and open, meaning paddlers should be prepared for potential wind and cooler conditions, which can arise quickly; spray skirts and windbreaker jackets are recommended gear. The water itself is noted for its intense sun glare, requiring sunglasses. The tours typically last about 1.5 hours on the water within a total 3-hour excursion window. Puerto Tranquilo also functions as a gateway to the Laguna San Rafael National Park, located approximately 51 kilometers to the west via Route X-78, though this access is for driving, not paddling.