I think it is good to note that Portland is not an 'attractions' based city. There are very few, if any, that are particularly noteworthy. In other words, you aren't going to find a space needle here. What you will find is a city that has subtle charms, vibrant, friendly, an amazing food/booze scene with easy access to the physical beauty of the pacific northwest. It definitely has its 'shiny' elements and a somewhat unrelenting hipster element, however it still remains amazingly human and accessible.
A couple of things not mentioned above, Washington Park and the Japanese Garden within its boundaries, is spectacular, the garden rivals any outside of Japan. The Chinese gardens are equally impressive and are built within an urban footprint rather than a park.
Google this stuff and check out travelportland for more specific information.
ps.
I'm not sure where pacific northwest is coming from, but I've never heard of any moose in oregon.