Baltra Island, also known as South Seymour, is truly the entrance to the Galapagos Islands. Despite not being considered as part of the National Park proper, Baltra definitely offers a taste of the weird and wonderful nature that thrives on the islands.
The island is located in the central part of the archipelago. At just eight sq. mi it is one of smallest islands, yet its flat, volcanic rock surface and central location in the archipelago makes it an ideal place for one of the islands’ two airports. The airport was built by the US Air Force, who used it as an army base during WWII.
As a travel destination in itself it offers few attractions, and all travellers who come here are just passing through, either on either way to or from the islands. There is no tourism infrastructure (save a few agencies that offer tours of the islands) or shops on Baltra and any purchases that you might wish to make should be done at the airport if they can. However, land iguanas and Galapagos finches are popular sights, and the iguanas are often seen running across the runway itself.
As you cross the Itabaca Channel to or from Santa Cruz, be on the lookout for some other Galapagian locals: giant turtles and playful sea lions completely oblivious to the humans around.