Channel Islands National Park

Look south from any beach in Santa Barbara and the Channel Islands fill the horizon — and visiting them is the single most memorable day trip from the city. Channel Islands National Park protects five islands and the waters around them, a chain isolated long enough to evolve its own species (the island fox, smaller than a house cat, is the famous one) and kept nearly empty: no hotels, no shops, no cars, just campgrounds, trails and an ocean that ranks among the richest marine environments on the West Coast. The classic first visit is Santa Cruz Island, the largest island in California, by way of the park's official concessionaire, Island Packers, whose boats leave from Ventura Harbor and Oxnard (about 40 minutes' drive south of Santa Barbara). The crossing takes about an hour and fifteen minutes and often turns into a wildlife cruise, with common dolphins riding the bow and whales in season. You land at Scorpion Anchorage, a sand-and-cobble cove with a historic ranch, picnic tables and a small campground, and the day is yours: hike up to Cavern Point for cliff views over the channel, continue to Potato Harbor, snorkel the cove, or join a guided sea kayak tour into the sea caves that riddle the island's north shore. Day-visitor fares run around seventy dollars for adults, less for seniors and children. There is nothing to buy on the island, so pack food, water, layers and sun protection. Book ahead; this is a trip that rewards planning.

Why it matters: these islands were never connected to the mainland during the last ice age, so plants and animals that arrived here evolved on their own, producing species and subspecies found nowhere else — the island fox, the island scrub-jay on Santa Cruz, and endemic plants among the ridges. The Chumash lived on and traveled between the islands in plank canoes for thousands of years, and Santa Cruz carries traces of that history alongside nineteenth-century ranching. The park's waters lie within a national marine sanctuary, and the kelp forests and sea caves make it a world-class kayaking and snorkeling destination. It is one of the least-visited national parks in the country, which is precisely its appeal: you step off the boat into near silence.

Planning the day: book Island Packers in advance, especially for weekends and summer, and arrive at the harbor at least 45 minutes early for check-in. The boat is the only way most people get there, and landings depend on sea conditions — trips can be cancelled for weather, so build a flexible day into the plan. Scorpion Anchorage is the right first destination: the Cavern Point loop is a moderate climb with immediate payoff, Potato Harbor adds distance for strong hikers, and the beach is the base for snorkeling and for kayak tours run by permitted outfitters (book those in advance too; rentals require reservations). Bring everything — water above all, since there is little shade on the trails — and carry out all trash. The fox is often seen around the campground; never feed it.

Fitting it into a Santa Barbara trip: it is a full day, door to door, so give it its own date and put an easy evening after it. Families with children who can manage a boat ride and a few miles of walking will remember it for years (the concessionaire publishes advice on travelling with small children); couples should consider an overnight camp for the night sky. The Robert J. Lagomarsino Visitor Center in Ventura Harbor is worth a look before boarding. And if the islands are booked or the sea is up, a whale-watching or sailing trip from Santa Barbara Harbor offers a taste of the same channel.