There are five main islands in Channel Islands National Park, off the coast of Southern California near Ventura. The two easiest to get to are Anacapa and Santa Cruz, which are the only two I have been to so far. The other three are Santa Barbara, San Miguel, and Santa Rosa Island.
Anacapa Island is a good day spot in the park for a day trip. The island itself is pretty small so I would not recommend camping on it as there is not a lot to do, but is great for a day of exploring.
How to Get There
I put together this short video to show you how to book your trip to the island and your campsite.
HikesThe hikes below are all from Santa Cruz Island since Anacapa island is easy to walk around and doesn't have a lot of designated trails.
Historic SitesThe islands have a long history through both the Chumash Indians and the farmers that worked the land in the 1800's - 1900's. Here are some of the most unique structures.
Smugglers Ranch (Santa Cruz)
Oil Well (Santa Cruz)
On the boat over you can often see dolphins and whales.
There are hundreds of these small foxes on Santa Cruz Island, which are a fun addition to the island.
One of the top attractions on Channels Island National Park is kayaking. The best way to do it is to book a trip with one of the local kayaking companies in the Ventura / Oxnard area and they will take the kayaks over for you and show you many of the different attractions on the water like sea caves and even Arch Rock.