Rainbow Canyon

So i have court on april 3rd 2013 for a parking ticket.My self and approx of 5 other vehicles were cited for parking accross from rainbow canyon in hurricane ut. All vehicles were not parked in street but in a dirt lot next to fence. The next morning they were all ticketed and had only 48 hours to move or be towed.My biggest complaint is there are no signs stating that we cannot park there.All vehicles were not obstructing any traffic. What should i do???