Take a stroll along the historic Santa Monica Pier and its amusement park rides while enjoying the views of the Pacific Ocean. Grab a bite to eat at the local eateries before exploring the Third Street Promenade shopping district.
Enjoy a day of sunbathing and surfing at Malibu Surfrider Beach. Afterward, learn about the history of Malibu at Adamson House, a Spanish Colonial Revival-style mansion that also houses the Malibu Lagoon Museum.
Venture to the Channel Islands National Park to explore the uninhabited islands and its diverse ecology. Hike, snorkel or kayak alongside the islands' unique flora and fauna. Be sure to check the ferry schedule and plan accordingly.
Take a break from the beaches and head to the mountains for a day at Lake Arrowhead. Rent a boat or go fishing on the lake or check out the mountain village shops and eateries. For a scenic drive, take the Rim of the World Highway.
Experience breathtaking views of the Sonoran Desert on the Palm Springs Aerial Tramway before heading to the Living Desert Zoo and Gardens to witness exotic species of animals and plants in their native environment.
End the trip with a relaxing San Diego Harbor Cruise to take in the stunning views of the city's skyline and coastline. Afterwards, head to Balboa Park, a cultural oasis with museums, gardens, and architecture.
If you have more time, consider visiting other coastal cities like Ventura, Huntington Beach, or La Jolla Cove. If you have less time, skip Lake Arrowhead and add a day trip to Joshua Tree National Park or Anza-Borrego Desert State Park. Make sure to check park and attraction opening/closing hours before heading out and make reservations for activities that require them, like the Channel Island ferry.