You will need to get a key ($5) from the main office. Otherwise, each gate has an opening that allows you to walk in.nevercry_wolf said:
Unfortunately, the Lee Kay Center is closed on Monday & Tuesday, so if you can swing by the office on Saturday, you would be able to get around easier.
There still is plenty of available land right by the gates, so you shouldn't be out of luck even if you were forced to walk in.
John