This is a fundraiser to raise money for worthy causes.
Here's some more information about it:
To support the work of two Yucatan environmental groups, Amigos de Sian Kaan and Punta Allen Verde, I have signed up for the GVI Charitable Trust Mayan Wilderness Challenge. We'll kayak 40 km south from Pez Maya through mangrove swamps of the Sian Kaan Biosphere Reserve to our adopted village of Punta Allen, then bike 50 km back up the peninsula to Tulum. If I make it (with your encouragement!), your donation will contribute to a new recycling center for the village and to mapping the reserve.
Please support the organizer's efforts by donating to one of the projects below.