Only one-quarter of Santa Cruz Island is national park land; the rest belongs to the Nature Conservancy. But since Santa Cruz is the largest of all the Channel Islands, measuring 96 square miles/248 square km and 20 miles/32 kms long, that park-protected 25 percent covers a whole lot of territory. The boat ride to the island is a quick a beautiful 1-hour cruise across turquoise sea—so you …

Source:: https://www.visitcalifornia.com/attraction/santa-cruz-island