Hola- A similar Question was ask a few months ago Not sure if you technically need one or not...If you did obtain one it would most likely be a first in San Carlos..have fun kayak away
I asked the same question a while back and received lots of help from this board. I was planning to bring a yak to SC but I found a rental fishing yak, so I will be renting for October. Someone suggested http://www.vagabundos.com as a source for fishing and boat licenses and insurance. I got my fishing license and auto insurance through vagabundos. They charge a small fee for the licenses, but do it via mail or fax so it is convenient. They had the best auto insurance prices I could find. Won't know if the insurance is any good, of course, unless I have a wreck!