Crater Lake National Park in Oregon's Cascade Mountains wows thousands of visitors annually with views of the deep blue waters nestled in the rim of the now-collapsed volcano. Wizard Island, a cinder cone of the old volcano, juts mysteriously out of the depths at the western edge while inspiring imaginations with its whimsical name.
Don't miss the Rim Drive, one of the most scenic roads of any national park, usually open from July through October, depending on snow. Check park conditions, here. Though only 33 miles long, take a couple of hours to stop at the many overlooks and picnic spots with fabulous views.
Pets on leash are welcome only in certain parts of the park, including parking lots and up to 50 feet away from paved areas. Check out the 1/4-mile paved promenade at Rim Village for great views of the lake with your dog. Get more dog info here, including which trails allow pets.