Santa Cruz is the second largest island in the Galapagos. A road crosses the island from north to south, giving a good opportunity of seeing some of the highland interior. The small town of Puerto Ayora is the economic center of the archipelago, with the highest population and greatest number of tourist facilities. Most visitors stay in Puerto Ayora while arranging a boat or sometimes anchor in the harbor of Academy Bay during their cruise. The Charles Darwin Research Station is based on Santa Cruz. It contains a national-park information center and a museum. The station is also a tortoise breeding and rearing center, where tortoises of different subspecies are prepared to be reintroduced in their natural habitat.