Traveling to PDX

Today our little family will be traveling to the Portland, OR and than to Vancouver, WA for the weekend. We will be visiting one of my wife’s cousins and her family. They will be taking us to the Oregon coast one day, and I’m sure we will also check out Multnomah Falls. However, I’m looking for some suggestions on where I can take some cool Photos. If you have any knowledge of the area and can help that would be awesome.