Bring along a picnic.
Option to go and visit the butterfly house as well as the mini beasts displays (there are meerkats!).
Arrive early to avoid parking issues, though there are side roads you can also park on outside of the designated car parks.
There are two pay and display car parks in Williamson Park - at the Quernmore Road entrance (15 spaces) and at the Wyresdale Road entrance (100 spaces).