McNary Wildlife Refuge.

I've taken my children here a number of times. They are in the middle of a remodel right now so it's kind of a mess, but it's still open to the public. In fact they have an activties for children one or two Saturdays a month. Here is the web address. http://www.fws.gov/midcolumbiariver/mcnarypage.htm Check it out. It's over in Burbank. Activities include:
Bird watching
Fishing
hiking
interpretive center

$Free$