1. San Juan Islands, WA
Located off the coast of Washington State, the San Juan Islands is actually an archipelago made up of hundreds of tiny isles, the main ones being Orcas Island, San Juan Island and Lopez Island. Although orcas (A.K.A. killer whales) can be found here all year long, the peak season for viewing lasts between May and September. They can be spotted on land—Lime Kilm Point State Park on San Juan Island is, hands down, the most popular spot for shore sightings—or via boat. Visitors can pick tour operators, including Maya's Legacy Whale Watching, Western Prince Whale & Wildlife Tours and San Juan Safaris.