Seacology is primarily a do-gooder NGO with hundreds of projects around the world. They mostly fund schools and even take on un-sexy tasks like building sewers, but the organization also has a small travel division that organizes trips to corners of the world where Seacology is at work. This year, tag along to Madgascar and South Africa in the spring, Fiji in the summer, and the Red Sea in the fall. The trips all include both style and substance (think comfortable rooms on preserved islands), as well as the knowledge that you'll be contributing to the local economy and Seacology's mission.

For more information, go to seacology.org.