Frenchilean
First, this place is amazing. It's unique, the colours are breath-taking, and there are still few people who visit it.There are two options to visit the Capilla de Marmol & Catedral de Marmol: take a boat tour from Puerto Rio Tranquilo, or drive a few kilometers to a place called Puerto Marmol, much closer to the site, where there is a small pier. From there, you can take a boat or rent a kayak, which my girlfriend and I did. We arranged it through our hotel El Puesto, and they took care of everything -although we had to driver there. It cost 30,000 pesos (about US$50), but it's not that expensive considering you are with a professional guide for 2 hours.You can choose the kayak option even if you are a beginner: It was my girlfriend's first time on a kayak, and she did not have problems to manage, as the lake is not difficult (unless when it's windy). The great thing about the kayak is that it allows you to get inside most parts of the marble caves and even disembark in a few places.A good idea, if you go with the guide from El Puesto Expediciones, is to come with two cameras, so that you can keep one with you in your kayak, and give the other to him, so that he takes pictures of you with the kayak and the monument.Although this was already a great experience, I would recommend even more another place in the same area with much more marble caves: It is called Puerto Sanchez, on the same Lake General Carrera. There is an island there that has close to 1 kilometer of marble caves! It is less accessible as the dirt road to the town of Puerto Sanchez is a bit difficult (but it has beautiful landscapes and views!), but it is even more spectacular than the Marble Chapel & and the Marble Cathedral. Contact Luis Alarcon for a fairly priced boat tour from Puerto Sanchez. He is a good, friendly and knowledgeable guide and boat driver, and a pioneer of the tourism at the marble caves: lualo1@hotmail.com