Schutzie has has some experience with judges and DA'S.
I'd recommend that you start by reminding them that you are Merican and you know your rights, and this is all bullshit, by God, as a Kayaker you have the absolute God given right to put your boat in whatever puddle you take a hanker to.
And remind them that they are NOT in a position to judge you, and if you don't get your boat back RIGHT DAMN NOW you're gonna make them sorry they ever heard your name................
Ok, seriously, contact the DA's office and find out who has your file. Explain yourself, that you were just seeing how good your roll and shoulder were doing, your Kayak is clean enough to eat breakfast off of (you know this to be a fact because you do indeed eat your meals off of your Kayak while on the river) and you had no idea you were violating any rules; in fact, you might make the case that you can't read because of a prior brain injury..........OK, sorry, just kidding..........and basically ask what to expect.
If the DA takes a liking to you there's a good chance they'll just drop the charge all together. I mean, it ain't like you peed in their damn lake.....
But at least you'll have a better feel for what the DA has in mind with you. You know, so you know if you should bring your toothbrush to court.
Good luck, hope the humor helped.