We took the Big Pink tour of Portland, Oregon since we had never been to the city before. The tour guide was very informative and went at a nice pace.
The city itself was a real eye-opener. We enjoyed seeing the Japanese Garden and the trendy restaurant/shopping area, but to be honest, the rest of what we saw on the tour was very average. It probably didn't help that it was damp and cool and we were in shorts!
If you have some time in Portland, take the tour, but it's nothing to write home about.