As one of Guatemala's most celebrated destinations, Lake Atitlán attracts visitors with its sweeping views, wellness retreats, and nightlife. But one eco-entrepreneur says that the postcard-worthy scenery masks a deeper crisis — and that even a small share of tourism could help reverse it. What's happening? In a recent Instagram post, Creative Solutions Permaculture (@creasolpermaculture), who lives near Lake Atitlán, warns: "Lake Atitlán is dy…