The John Kieran Preserve includes 10.5 acres of mature woodlands and wetlands that are home to a wide variety of trees and plants, as well as birds and other wildlife. The land was gifted to the Town by John F. Kieran, a distinguished author and naturalist who summered in Rockport. It is managed by the Rockport Conservation Commission, in partnership with Cape Ann Trail Stewards.

Trails entering from Marmion Way and Straitsmouth Way form a circular loop through the center of the Preserve, providing an easy 0.75-mile walk through varied terrain that has the feel of wilderness. Hiking footwear is advised. Take precautions for insects and ticks. A short walk down Straitsmouth Way is Gap Cove, a Town-owned beach and landing open to the public and a popular spot for launching kayaks.

The main entrance and Kieran marker stone is between 90 and 92 Marmion Way. A secondary marked entrance is on Straitsmouth Way.

Unrestricted parking is allowed along the east side of Marmion Way.