If you have a hire car / our own method of transportation, this isn't too difficult to find and is well worth making a day out of your visit. Crystal Castle has something for everyone, although I'm not one to be too into crystals and the like - the gardens are breath taking, you're taken on a journey from one landscaped area to another, which poems, history and education of Buddhist idols throughout the area.
So many beautiful monuments, local flora and fauna, amazing scenery and jaw dropping giant crystal clusters / boulders. Be prepared to take a lot of photos, a little under $30 entry (less for kids and family passes available) but well worth the day out!!
Approx 40 mins drive from Gold Coast airport and less than 20 minutes from Byron Bay.