Below you can find a map marking all the playgrounds in the Maltese Islands:
Some of the most popular playgrounds around the Maltese Islands include:

Bugibba Waterpark
Bus number 48 from Valletta

Marsascala Sant'Antnin Family Park
Bus numbers 92, 93 from Valletta

Rabat Playground (near Mdina Exntrance)
Bus numbers 51, 52, 53 from Valletta

Sliema Independence Gardens
Bus numbers 13, 14, 16, 17 from Valletta

Sliema Qui-si-sana Playground
Bus numbers 13, 14, 16, 17, 21 from Valletta