5900 Lake Washington Blvd. S, Hillman City
This park is actually located on an oblong peninsula that protrudes into Lake Washington, so there are beaches and water access on almost every edge of the space (which is 300 acres in total). The paved bike path through the lush forests—2.4 miles round-trip—makes it a popular spot for jogging or bike riding, and there are plenty of places for picnicking or just enjoying the view. The park is also home to a gorgeous Audubon Center, which hosts camps for kids during the summer, and kid-friendly birding walks during the year (friends have seen everything from eagles' nests to owls walking the grounds).