Channel Islands National Park — five rugged islands off the Ventura County coast — is Oxnard's most important attraction, and the harbor is the primary ferry gateway to the park. The islands offer hiking, sea kayaking, snorkeling, and wildlife watching in a landscape that feels genuinely remote despite being less than an hour by boat from the mainland.
Anacapa Island is the closest, a 45-minute ferry ride, with dramatic sea arch formations and nesting grounds for western gulls. Santa Cruz is the largest island, with a backcountry cave system, kelp forest kayaking, and excellent hiking. The ferry operator (Island Packers, based at the harbor) runs scheduled crossings to multiple islands with varying crossing times. Camping is available on most islands with advance reservation through the National Park Service.