If you choose to contest the ticket, you should return to the area and take photographs documenting your contention that the signs are not readily visible from the street when you are parking. Be prepared to answer questions about whether you regularly park downtown, etc. How much is the parking ticket? It may cost you more in time and effort (and the parking cost!) to contest the ticket than to just pay it. It's not a moving violation and therefore will not affect your driving record.
Valerie FarrisAsk a similar question
I would contest the ticket. But you need to take photographs showing the signs are not visible from the street when you are parkingAsk a similar question