Kennewick WA has a lot to offer the family that wants to live near the country, but not actually in it. Farms and vineyards dot the surrounding land, and three rivers converge here to offer plenty of boating and river fun!
If you are traveling between Oregon and Spokane, this is an excellent stop over!
Be sure to see what is going on in town by visiting: http://www.visittri-cities.com/
In July, the Hydro boats are here for 3 days, and in the winter, lots of small town craft shows and holiday events! The Pasco Fiery Foods Festival is fun to visit in the summer, and car shows are abundant in this area as well.
I strongly suggest you also try to go east towards Lewiston Idaho via HWY 124 out of Burbank Heights, to later connect with highways north to Spokane, this way you can see the real country side of Eastern Washington! :)
Going through Waitsburg WA and Dayton WA along the way, you will find little shops and stores to spend your day, and great little restaurants to dine at!
Have fun, and happy traveling! :)
p.s.-If traveling in the winter months, DO be prepared for snow and ice!