Portland is perfect. The climate is just right. If you visit in summer, the weather isn't too hot. If you come in winter, it's not too cold. Portland's mild climate is from its location--only about an hour and a half drive to the ocean. My only complaint, and it's small, is that it's too cloudy.
Rocky Butte--You must find this place. Visit just before sunset for a spectacular view of the city. Linger until after dark to see the rivers and city lit up in lights.
Powell's--Enjoy reading? Check out Powell's. It's the biggest bookstore in the country. They sell new and used books cheap. Just don't get lost inside.
Portland library--Can't get enough reading material at Powell's? The library is the place to go. It's only a few blocks away.
The International Rose Test Garden--Next to the zoo is a floral wonder. Sit on a bench and breathe in the romantic fragrance along with Portland's purest air.
The Japenese Gardens--Up the hill is the Japenese garden. You will see many rock gardens, waterfalls, and native Japenese plants.
Quick Tips:
While you're in Portland, don't forget to take advantage of the delicious west-coast cuisine. Grill some salmon and veggies.
If you're driving, it's illegal to pump your own gas. There's no sales tax on anything too!
Best Way To Get Around:
Ride the Tri-Met--the mass transit system. It'll take you just about anywhere you want to go. It perserves the clean air Portland offers. Besides, you get to observe the people who live there.