If you're staying overnight in Hood River or simply want to see this stunning waterfall en route to the ceremony, Multnomah Falls is just 31 miles west of Hood River on scenic and historic Highway 30.
Here are a couple of links to finding some great hikes while you're in the region:
https://gorgefriends.org/hike-the-gorge/find-a-hike.html
Rent a kayak or stand-up-paddle board in Hood River and enjoy the Columbia River up close. There are several centers to check out for renting equipment and taking lessons.
There's also rafting!
Western Antique Aeroplane Automobile Museum is a great place to visit with more than 100 antique cars and airplanes
301 Gallery -- a co-operative featuring the work of Gorge artists
The History Museum of Hood River County -- on Port Marina Drive
Mount Hood Railroad scenic train rides along the Hood River
Columbia Gorge Interpretive Museum is a wonderful museum in Stevenson, about 22 miles away on the north side of the river
Maryhill Museum of Art, 45 minutes from Hood River