Fort Glanville Conservation Park

I've got to admit I'd driven past this place hundreds of times and never gone in. Now I'm wishing I'd done so earlier. It really is a gem of history that is actually interesting and interactive for both adults and kids.
Between the cannons (that are real, we were lucky enough to have the biggest one be set off while we were there), the dungeons, the displays and the volunteers' demonstrations there's really a lot to this. To be fair it's not the most 'professional' presentation but given that it is really staffed by volunteers that's ok - and because they're volunteers they do actually care about the place, not just people paid to be there.
History or war battle buffs will find the visitor centre particularly interesting though for my 9 year old that part was dull - but she still enjoyed the whole experience. All this for just a few bucks entry means it's a great family activity when they're open (it's only about once a month).