If you cannot find the Waterfront park on Google you can type in Solstice, Stoked Coffee Roasters, or Tofurkey to find the area you should head towards.  If you go to any of these on Google maps, or Apple maps for that matter you will see hopefully lots of parking and you can then take a walk around the river, get some coffee or food, let the kids play as you enjoy the view of the water, hopefully it will be a nice sunny day so you can see the surrounding beauty of the Columbia Gorge.