I am a huge fan of transportable boats. I own an Advanced Elements inflatable Kayak already, but this looks like it could give it a run for its money:
![kayak.png Folding Kayak](http://benhanna.com/wp-content/uploads/2012/11/kayak.png)
The Oro Folding kayak folds up into a case and is only 25 pounds.
![case.png Folded](http://benhanna.com/wp-content/uploads/2012/11/case.png)
More at: http://www.orukayak.com/