dude ,,, no where at the park ,,,does it say not to ride in the river !!! It just says not to cross cuz ur tresspassing ont some1 else's land !!! If riding the river banks was so illegal ,, i think some1 at the park should inform riders by either posting signs or adding it to there so called rule list !!!! Dont get me wrong ,, im all about obeying the law to keep land open ,, but if it is not posted on some1's private property then it is hard to determin what is legal and what is not !!!!!