Tame and well-tended Washington Park contains several key attractions within its 400 acres of greenery. The International Rose Test Garden is the centerpiece of Portland's famous rose blooms; there are 400 types on show here, plus great city views. Further uphill is the Japanese Garden, another oasis of tranquility. If you have kids, the Oregon Zoo and Portland Children's Museum should be on your docket.
Other attractions include the Hoyt Arboretum, which showcases more than 1000 species of native and exotic trees and has 12 miles of walking trails, and the World Forestry Center, an educational museum highlighting forests and their trees. Check the website for information on the free shuttle within the park.