Welcome to Oregon!
A kayak is very feasible on the Willamette above the falls at Oregon City, especially after the spring runoff. It's possible to drift downriver from launch to takeout, or paddle up and back from a spot like Newberg or Wilsonville. The river abounds with smallmouth bass. Also try the Mollala River below Canby out to the Willamette, or its trib, the Pudding.