The incident happened at the Miriam Lane facility between 6pm on Monday October 24 and 7am the following day.
According to police, thieves have forced their way into three separate buildings on the site, namely the ticket office, shop and canteen, and carried out searches before leaving.
Nothing was taken.
PC Lee Hammond, investigating, said: “I would like to encourage anyone who saw any suspicious activity around the time of the crime, or has any other information about it, to get in touch.
“It may be that you saw a suspicious vehicle in the area, or people you do not recognise hanging around.”
Anyone with information should contact PC Hammond via the non-emergency number 101. Alternatively, call Crimestoppers anonymously on 0800 555 111.