I love driving along the Columbia River and the Hood River - there is a camping area along the way but I am always on my way to my niece's home in Central WA or on my way back home to CA. There is so much to see - but I do love he Bend OR area - it's too bad you aren't going to be there in early July, you could see the Sisters OR quilt show. It was quite fun.
Hope you enjoy your trip - I would love to do it some time. My DH's cousin lives near Sisters OR and we visited with them the last time we drove up. It is such a beautiful area.