Cowan Creek is a major tributary of the Hawkesbury River located within Ku-ring-gai Chase National Park, approximately 40 minutes north of Sydney. The creek occupies a drowned valley flanked by high sandstone escarpments and flowering native bush, giving it a distinctly wild character despite its proximity to Australia's largest city. The water is notably clear, particularly in summer when it also becomes warm enough for swimming, and sandy beaches and sand flats are accessible along the banks.

The primary launch point for paddlers is the Bobbin Head Picnic Area, which has a dedicated canoe launch. Apple Tree Bay, in Mount Colah, provides an alternative access point with a four-lane concrete boat ramp, jetty, toilets, picnic tables, and fish cleaning stations. Parking is available at both locations.

From Bobbin Head, paddlers have two main directions. Heading south up Cowan Creek past the marina is a return trip of around 9 kilometres, though the creek narrows and becomes quite shallow in its upper reaches, making this direction problematic at low tide. Heading north toward Cottage Point opens up an essentially unlimited route of at least 7.7 kilometres one way, where the creek widens and tidal currents become progressively stronger. A guided tour operator runs an 8.5-kilometre, four-hour kayak tour departing from Bobbin Head into Cowan Creek, with a stop at a sandy beach.

Tidal movement is a significant factor on Cowan Creek. The tidal swing can reach approximately two metres, and currents can be quite strong, particularly as the creek widens toward the Hawkesbury. Paddlers should plan routes with tidal timing in mind. Some coves and anchorages become very shallow at low tide.

The creek passes through the traditional land of the Guringai Aboriginal People, and Aboriginal rock engravings are present in the surrounding national park. The sandstone walls, native bushland, and relative absence of development contribute to a quiet, unhurried atmosphere. Wildlife commonly observed includes herons, cormorants, and sea eagles. The Bobbin Head marina is passed when heading south, and the historic picnic area adds a point of interest near the launch site.