Powerhouse Museum in Ultimo is great. Also in Ultimo, the Ian Thorpe aquatic centre is indoor and heated. Darling harbour has the Aquarium and Wildlife World (not cheap, but really good). The mono-rail is a loop. If they're train-crazy like my son, Central station is always interesting and 'free' (and you can catch the tram to get there). You can catch a ferry to Fort Dennison (just off the Opera House), it's a real fort, so go and play pirates.
That should soak up the next couple of wet days.
Phil over 6 years agoAnswered by Phillip Sylvester