You can park near by or drive right up to it if you dare. As the name suggests you will need water, about 3 litres should be enough.
Your mission should you except it is to work out where to put it. Not enough room in this one for a pen so bring your own.
The motorway is near but this site is still good for children.
There is parking at the intersection of Coalstage Rd and Morris Rd. S 45 53.838 E 170 21.886