Nestled at the south end of Darling Harbour is Tumablong Park. The five-hectare, waterside park offers a pocket of serenity, despite being right in the middle of all the hustle and bustle of the city. Brimming with water features, sprawling play areas and the Chinese Garden of Friendship, Tumbalong is frequented by families, culture seekers and tourists alike.
In summer, you can cool off at one of the water features or sit under the shade on a deck chair. If you're looking for fun, head to the huge playground or to the communal (free) ping pong tables. There's an old-school carousel within the park, too.
For something more tranquil, stroll through the Chinese Garden. There, you'll find waterfalls, sculptures, lakes and local wildlife, such as koi swimming in the ponds, water dragons and lots of colourful birds. While the rest of the park is free, entry to the Chinese Garden of Friendship ranges between $3–6.
Tumbalong Park is right by Sydney's International Convention Centre and is surrounded by a bunch of cafes and restaurants. Plus, it's easily accessed by bus, ferry, light rail or train (less than a ten-minute walk from Town Hall Station).