I'll be taking the train down to Portland from Seattle, WA. I was delighted to get involved with UrbanSketchers last summer, after following a link from Gabi's "Seattle Sketcher" blog.
I've been sketching in a tiny 2" x 3" sketchbook on walks in Schmitz Preserve Park for years (and finally started posting those to a blog). It's 10 minutes from where I live, and has a great creek and the only old growth within the city limits.
For sketching farther from home, I often use a Pen Sketcher's sketchbook, as illustrated in Don's post. I had it today at Fishermen's Terminal...
... but prefer something smaller when Seattle weather drives me into a cafe instead.
Like Lisbeth, I love to sketch journal when I travel. Really looking forward to sketching with you all in a few weeks!