Eureka, California Must Do's See the Coastal Redwoods like those at Prairie Creek State Park, one of the few remaining old growth forests. A ranger guided tour and/or a mountain bike adventure is the best way to explore these fascinating trees at the park; the trails are not that difficult and the scenery is fantastic. In addition to the redwoods, which are impossible to miss, watch out for wild Elk, Fern Grottos, Banana Slugs, and picturesque waterfalls. Enjoy the picturesque Victorian houses that line the streets of Eureka, there are more Victorian houses here per capita than anyplace in the U.S.. The most famous of these is the Carson Mansion, an incredibly picturesque Victorian house that is literally in the very heart of Eureka.