There are a couple of groups of islands. The Farallon Islands are about 35 miles off the coast of San Francisco. Further south, the "Channel Islands" are south and southwest of Santa Barbara.
The Channel Islands lie parallel to the coast of Southern California from about Santa Barbara to south of Los Angeles. The chain has a number of islands ranging from tiny San Miguel to the large Catalina, Santa Cruz, and Santa Rosa. Catalina is the most tourist-friendly island with regular boat service from the LA area and many tourist amenities.
Further north (near Ventura, California) is Channel Islands National Park. This park, often referred to as "America's Galapagos" is a rich natural preserve. This national park is known for its birds and marine life. There is daily boat service by Island Packers from Ventura and Channel Islands harbors to the various islands. The islands are largely unimproved and you can camp on several of them. The popular children's book, "Island of the Blue Dolphins" is set in the Channel Islands, as are several fictional books by contemporary author, T.C. Boyle.
The Farallons are off the coast near San Francisco. Alcatraz is an island in San Francisco Bay. Many tourists visit Alcatraz and Catalina, but the Farallones are hard to get to.
Here are some other island options:
These are known as the Channel Islands.
The Channel Islands of California
There are a couple of groups of islands. The Farallon Islands are about 35 miles off the coast of San Francisco. Further south, the "Channel Islands" are south and southwest of Santa Barbara.
The Channel or Santa Barbara Islands
The islands name is the Canary Islands.
The Channel or Santa Barbara Islands
Falkland Islands
Socotra Islands
There are many islands off the west coast of Ireland. The three that you are referring to are the Aran Islands. They are Inishmore, Inishman and Inisheer.
The Aleutian Islands.
the isle of wight
canary islands!