Take your pick of two giant outdoor water slides at what's affectionately known as "Botany Big Splash". The aquatic centre also has two outdoor swimming pools, a shaded and heated pool for the little ones, a children's play area and a large grassy area for post-swim barbecues.
Just one-hour's drive from Sydney, Jamberoo has 13 water rides and attractions including the scary Funnel Web. It's one for the bigger kids, as riders on the Funnel Web can reach speeds of 30km an hour as they shoot through long, fast water tunnels.
Located next to Manly Sealife Centre at the end of the wharf, Manly Waterworks is a tiny water park with three short water slides. As long as you measure up to 1.1m-tall, it's the perfect way to combine all the fun of a water park with a day at the beach.
Parramatta pool has a 50m outdoor pool with two long water slides that travel through the bushy surroundings. There's no age restriction, so adults can ride along with younger children. We're told it's a little bit dark and scary – but that's all part of the fun! Cost: $3 for six rides.
Not only does this aquatic centre have an Olympic-sized pool for adults, but it has super facilities for kids too. There's a giant, 56-metre waterslide, a wave pool, bubble whirlpools, a rapid river and a paddling pool for bubs.
Loop, loop, splash! When it's really hot, stay out of the sun and get yourself indoors. That's right, we said inside. Sydney Olympic Park Aquatic Centre is a great indoor pool and there's a spiralling waterslide and kids pool.
Saving the best till last – it's gotta be the 360Rush, a mammoth set of duelling slides that each loop a full 360 degrees. Climb six storeys to the top, then race ya mate down the slide. You'll hit speeds of up to 60km/h. Which in water-slide-speed terms, is pretty darn fast.