Is It a Requirement to Register an Adventure Island in Calif

Looking for some advice about registering an Adventure Island. Here's what the CA DMV website says about registration requirements:

What Vessels Must be Registered?
Generally, every sail-powered vessel over eight feet in length and every motor-driven vessel (regardless of length) that is not documented by the U.S. Coast Guard which is used or on the waters of this state are subject to registration by the Department of Motor Vehicles (DMV). The vessel must be located in California.

The following vessels do not have to be registered in California:
• Vessels propelled solely by oars or paddles.
• Nonmotorized sailboats that are eight feet or less in length.
• Nonmotorized surfboards propelled by a sail and with a mast that the operator must hold upright.
• A ship’s lifeboat (a dinghy is not a lifeboat).
• Vessels currently and lawfully numbered (registered) by another state that are principally used outside California.
• Vessels brought into California for racing purposes only (exempted only during races and tune-ups).

OK - so I have yet to see an Adventure Island with a CA Vessel Registration number on it, so what part of the puzzle am I missing? Any good info that anyone might be able to share would be much appreciated. Thanks...

you do have to register it...
there are guys up here that have done it

Thanks, coachstevo. It seemed like that was the case. I appreciate the info.