Ross Birkle, 4, visiting Maine with his family from Cincinnati, jumps from rock to rock in the upper pond at the Children's Garden at Fort Williams Park.

Hudson Bush, 2, plays in the hillside stream in the Children's Garden at Fort Williams Park. He visits the park once or twice a week with his mother, Quynn Morehouse.

Hudson Bush, 2, of South Portland plays in the hillside stream in the Children's Garden at Fort Williams Park on June 30. His mother, Quynn Morehouse, said, "He woke up this morning and said he wanted to go to the waterfalls."

Julian Cekutis, 1, plays in the steam in the Children's Garden during his first visit to Fort Williams Park in Cape Elizabeth.

Ellerie Oster, 1, dips her tiny feet into the stream in the Children's Garden at Fort Williams Park in Cape Elizabeth.

Jayden Baker, visiting Maine with her family from Orlando, Fla., goes down the granite slide in the Children's Garden on June 30.

Kids play on the granite slide in the Children's Garden at Fort Williams Park. The garden draws a variety of children with their parents, grandparents, nannies, babysitters and family pets.

Hudson Bush, 2, looks back at his mother, Quynn Morehouse, as he plays in the hillside stream in the Children's Garden at Fort Williams Park.

James McCain, the arboretum director at Fort Williams Park, said, "Even last year, when the garden first opened, kids were splashing around and yanking out the few plants that were in the pond at that time. I was hyperventilating."