TIMP

The one at Beauty Point? I think there may be a similar one at Stanley as well.
AFAIK (never having been there despite having work in Beaconsfield) it has a fairly good rep - am pretty sure it is used as a school excursion for some schools if that helps.
If you head out to the Nut at Stanley its a good hard climb up the top - but the gondaliers may be working - amazing views.
BRING JUMPERS AND RAINCOATS! Its been freaky arsed weather down here lately...and no one knows if/when its going to improve.
I just thought, there may also be plays in the Park (Aladdin) during december...(in the Botanic Gardens).
In Lonnie there is some good stuff around Cataract Gorge, and Penny Royal world is apparently nice is a kitsch sort of way. (not much use but the Stillwater Deli is to DIE for...expensive but yummy sandwich fixings).