This is a big varied garden just across the road from the river. It has grassy knolls overlooking lotus filled lakes, tree filled areas and nice views over the city.
It is beautifully maintained and it is possible to take a gondola ride around the lake. (They don’t sing opera, though!)
Make sure you walk up the hill to Guilfoyle’s Volcano, which has a fantastic collection of succulents and cacti around it. A nice day out from city sight-seeing.