Big 4 Castlemaine Garden Holiday Park will give members 10% discount when you book just mention 3RAR. 

They offer powered ensuite sites as well as powered sites. 
1  bedroom,  2 bathroom and 3 bedroom 

Phone(03) 5472 1125

Free Call1300 472 762

Address
BIG4 Castlemaine Gardens Holiday Park1 Doran Ave (off Walker St)Castlemaine 3450VIC

https://www.big4.com.au/caravan-parks/vic/goldfields/castlemaine-gardens-holiday-park/contact