technically, you have to run silencers and spark arrestors. Stay in the back with it and more than likely you wont get bothered. I have been checked for sound, but it was on the beach. If you are in the back and not doing anything to draw attention to yourself, you will probably be fine.
Kevin, i assume you are taking your motorhome out there, air down buddy and hopefully you have tow hooks on the front and a 4x4 in your crew. Sometimes it can be a pain getting motorhomes in and out, but the camping on the beach is worth it. Lots of fun. Check the tide schedules if the river is up, you will want to go in at low tide. Austin, what is river like now?? Sometimes it is nonexistant, other times it can have a pretty good lip on it, thats when you need to go in at low tide and swing wide.