I hope a road trip also means a ferry trip or two. The nearby islands offer wonderful food and magnificent views on the way. You should also plan for some time in Vancouver,B.C. for the restaurant meals and the Asian markets. Once your schedule is firmed up,I'm sure everyone will have specific tips for you including what not to miss at Pike Place Market. My friend who worked at The Herbfarm had nothing but raves for the experience,but you do need both money and time. Portland has food, wine and farmers' markets,as well. It would be hard to have a bad time in the Northwest and most of us would be glad to act as tour guide.