Living on a sailboat is a sustainable travel lifestyle, using the wind to travel instead of gasoline and solor is used to charge your electronics. It also promotes healthy activities: swimming, stand-up paddling, canoeing, snorkeling and diving. Hiking and biking are the way we get around on land when we visit places. We also buy from the locals and that supports the local economy. So a sustainable travel project looks to me like living on a sailboat!