I also loved having public transportation at my fingertips. Portland has a particularly good system for that, which fascinated me endlessly when I lived there. It would always amaze me that I could literally get from one end of the city to the other merely by walking/busing/taking a train. I lived there about 5 years before I even got a car... and even then, I would leave it at home most days to travel downtown to work. It was just faster to take the train... plus you can't read a book while driving yourself somewhere! Lol.
The other thing I miss about Portland was it's awesome sense of "team spirit", if you will. People who live in Portland love living in Portland, and it shows. The annual Rose Festival is a town event and it's quite common to visit the festival grounds several times a week while it's going on (whether for a parade, dragonboat race, or for the carvnival itself). People also tend to congregate in Pioneer Square, especially in the summer, for free concerts, sandcastle-building exhibitions, etc. There's a definite sense of group identity in Portland that makes you really excited to be there and see what's going on!
Downtown is always really fun too. I loved walking around down there, seeing the tall buildings, visiting the awesome stores. If you've never been, you should go see Powell's Books. It's literally so big that they have a map you can grab at the door to help you navigate your way around! I got in the habit of only taking in the amount of money I wanted to spend because it's really easy to justify buying way too many books! They've got pretty much any book you can think of and usually at a really great (used bookstore) price.
In the 10-20-year plan for my life, I probably won't end up back in Portland anytime soon, but hopefully I can retire there! I want to see other great cities in the meanwhile, but I think Portland will always be my first love. ;)