Sydney on May 30

[Archie's Mom]

We are a family consisting of two parents, an eight year old girl with long attention span, a four year old boy who is very active and grandparents in their mid-70s. We will be in Sydney on May 30 on HAL Maasdam. I see from my research that the underground mine tours start June 1 and the costumed guides at Louisbourg will not have begun the season either. I am looking for activities that we could all enjoy without spending all day in a car. I have reserved a rent car but would consider a ship excursion, especially if we would see things that an individual could not because of the early date. Mobility is not an issue but the 4 year old would be a problem at the Bell Museum I think. Suggestions please!