The biosphere is huge and you can end up doing 2-3 day trips if you wish. We discovered that too late but promised we'd do it next time we come to Tulum. We did not buy a group package. We drove to the site of Muyil and from there you park your car and walk about 2 miles to the lake. We arrived late during the day so we drove down and walked back up to be able to make it to the boats on time. Your walk will seem like you're in the jungle, cause you are and there will be a tower from which you can see the entire lake. Once you reach the lake you will be offered a boat tour ending in a channel where you get to float between the mangroves. Don't forget the sunscreen! And enjoy!
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