I was in Portland again last September for Cycle Oregon. It's a very short walk from the Red Line to the Amtrak station. (When you are in the arrival terminal facing the exits, walk to the right to find the Red Line.) IIIRC, you can see the tower of the station as you cross the river on the Red Line. Downtown Portland is pretty compact and easily walkable. If you need a good book for the tour, definitely stop at the giant, independent book store in town. Can't remember the name, but it's famous. You are probably better off leaving your bike and just walking around. If you need any last minute bike items, look up the Bike Gallery's downtown location. There is alo a big outdoor store in the downtown area. Can't remember the name of that, either, but if you search Google it will probably show up. If you want some interesting eats, there is a concentration of food trucks between SW Washington and SW Alder between 9th & 10th.