Teens are invited to join a special "Teen Team" in Trinidad to protect the local nesting grounds of the Leatherback Sea Turtle. While the new hatchling at right is just a few inches long and a few ounces in weight, when adult, these turtles may be 6 ft or longer and weigh up to 2000 pounds.
For the more serious eco-tourists, SeeTurtles.org can also coordinate other volunteer opportunities where fit and willing participants will be trained in turtle conservation and can lend a hand on actual turtle rescue and protection assignments. Be warned though - these are actual jobs that must be done, not just busy work for volunteers. Few things will stop the turtle team from making their appointed rounds. Participation fees run about what you would pay for an exotic adventure, but the altruistic bragging rights you gain are, as they say, priceless.
For more info: SeeTurtles.org