Poole is an easy town with children, largely because so much of what there is to do involves water and costs nothing.
Parks
Poole Park is the obvious one: a saltwater boating lake, a miniature railway, play areas and flat paths, all free to walk into. Upton Country Park is the bigger, quieter version.
Beaches
Hamworthy faces into the harbour, so the water is calm and shallow, with grass and a playground behind. On the bay side, Sandbanks shelves gently and is patrolled in season. See beach safety.
The island
Brownsea Island works as an expedition: a boat ride, red squirrels, peacocks and space to run. Book the boat ahead in summer.
When it rains
See wet weather fun. And whatever the weather, the lifting bridge on the Quay going up is free entertainment.