This property sits on the part of the Siuslaw River that is not effected by the tide - you can put a kayak in right there in front of the house, or go downstream a bit to the larger boat ramp. In the summer we spend hours tubing, kayaking and catching crawdads.
One of my favorite hikes is Sweet Creek Falls, which is just a short drive (although curvy, for those who get car sick), and the surrounding forest roads offer as much adventure as you'd want.