Take your fishing gear, warm clothes , drinks in an esky , a radio and your kids & go fishing off the beach. Even if you don't catch anything everyone has a great time. Set up an hour before sunset & maybe take a picnic with you.
Dress Code: Anything you want but do bring bathers and a towel if its summer
We are extremely lucky & get to stay on my sister's farm in Busselton. At night the kids all like to go out as it is very dark & they can play hide & seek or "spotlight" in the real dark as they call it.
Of course this doesn't work well when it's a full moon.
Dress Code: Dark clothes, old ones in case they get dirty. Small torch for spotting the ones hiding.