Tour the Hanford B Reactor! This reactor is the world's first full-scale plutonium reactor and was created for the Manhattan Project. It synthesized plutonium used during World War II for the Trinity Test as well as toward the atomic bombs. The scheduled tour dates around the time of the wedding are October 12-15.
Learn about the history of the Columbia Basin!
A quick, local hike!
If you want more wine, there are some great wineries out here!
A great hike about 1.5 hours from Tri-Cities! It's on the way back to the Pullman-Moscow area. While you can hike along the plateau around the falls, you can also hike up behind the falls and turn back. If you decide to hike the plateau, be aware of any slippery areas!
About 3 hours away, but well worth the drive! -- May be weekends only in October. Check the weather!