my FIL always stays out at Eaglehawk, as he can't get his 5th wheeler into most other parks in Canberra. EPIC is pretty crap imho, and I wouldn't camp there unless you were going to stuff that was on there. If you're planning to do floriade and the like, then queanbeyan park is probably be the closest and best choice (fyshick is terrible), but its probably booked out by now, so good luck.