Any avid gardener should be sure to make a trip across one of Seattle's two floating bridges to the city of Bellevue and its Bellevue Botanical Garden. This 53-acre garden is one of the Northwest's most highly regarded perennial gardens. The summertime displays of flowers, in expansive mixed borders, are absolutely gorgeous. You can also see a Japanese garden, a shade border, and a water-wise garden (designed to conserve water). April through September, free guided tours are offered Saturday and Sunday at 2pm.