No, these are two separate islands.
Kauai.
Kauai is geologically older than Maui. Kauai is estimated to be around 5.1 million years old, making it one of the oldest Hawaiian islands, while Maui is estimated to be around 1.3 million years old.
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Kauai
Kauai is older than Maui. Kauai, formed by volcanic activity, is estimated to be about 5.1 million years old, making it the oldest of the main Hawaiian Islands. In contrast, Maui is approximately 1.3 million years old, having been formed by the merging of two volcanoes, Haleakalā and West Maui.
By plane.
It depends what kind of vacation you want to have.
Visit Maui. I was on there and it is more calm and quiet while still having lots of fun activities to do.
Hawai'i Maui Moloka'i Lana'i Oahu Ni'ihau Kaho'lawe Kauai Nihoa From memory sucker. I don't suggest travel to kaho'olawe.
Hawaii, Maui, Kaho'olawe, Lana'i, Moloka'i, Oahu, Kauai and Ni'ihau.
Hawaii, Maui, Oahu, Kauai and Molokai.
Maui, Oahu, Kauai, Molokai, Lanai