Ginkgo Petrified Forest State Park in Vantage, Washington is just over 7,000 acres. The visitor center overlooks the Columbia River. When petrified wood was discovered in the area the park was created as a national historic preserve. The Forest  is a registered national “natural” landmark. Although we didn’t camp there (just stopped for the day), they do have camping year-round. It is an amazing drive along the Columbia River and you’ll find rock shops nearby to stop and buy souvenirs.