Morro Bay State Park on California's Central Coast sits beside a wide estuary, with the famous volcanic plug known as Morro Rock rising from the water. The mix of bay, marsh and hills makes it one of the most scenic coastal parks in the region. The park has a Museum of Natural History, a golf course and a marina, and its trails are great for birdwatching and quiet walks. Kayaking and paddling on the estuary are popular, and the nearby town has restaurants and shops. Entry is $10 per vehicle. Bring binoculars, since the estuary is a haven for shorebirds and waterfowl.