Some of the most spectacular scenery is found on a trip to the San Juan Islands. No wonder. This 100-million-year-old mountain range turned archipelago, located a few miles northwest of Seattle, changes dramatically with the tide. There are 743 islands at low tide--and 428 at high tide.

The four largest islands are Orcas, San Juan, Shaw and Lopez. They are loaded with bald eagles, herons, cormorants, puffins and osprey, which hide out in the madrona trees. Along the way, your vessel might be followed by Dall's porpoise, harbor seals or even orca whales year-round residents of the San Juan Islands. Even if you're there for a single day, you have time to take a Whale and Sealife Search led by a naturalist, or shop in the local galleries.