Here's some ideas of things you can do in and around the Pioneer Square neighborhood of Seattle (where the wedding will be taking place)
The oldest bar in Seattle. You can see the Seattle underground from the basement.
Address: 109 Yesler Wy, Seattle, WA 98104
Menu: places.singleplatform.com
Pioneer Square deli known for Philly cheesesteaks, subs & soups, also serving breakfast in the AM.
Address: 159 Yesler Wy, Seattle, WA 98104
Menu: tatsdeli.com
Dumplings in the Chinatown International District
Address: 504 5th Ave S #109, Seattle, WA 98104
Menu: https://www.doughzonedumplinghouse.com/menu
This Coffee Shop is in the same building as the wedding venue.
Address: 171 S Jackson St, Seattle, WA 98104
Located on the ground floor of Smith Tower (a beautiful 100 year old building with a 35th-floor observatory, if you are interested)
Address: 506 2nd Ave, Seattle, WA 98104
The fourth floor of Seattle's Central Library is a long, curving hallways that is entirely red (which matches Mary and Brody's wedding color). The library is also worth a visit in general.
Address: 1000 4th Ave, Seattle, WA 98104
A postmodern building with a fun red hallway and a fountain outside (that kids can play in in the summer)
Address: 600 4th Ave, Seattle, WA 98104
Located in Pioneer Square this small park has a beautiful man-made waterfall.
Address: 219 2nd Ave S, Seattle, WA 98104
The Seattle Central Library is the flagship library of the Seattle Public Library system. The 11-story glass and steel building in the downtown core of Seattle, Washington was opened to the public on May 23, 2004.
Address: 1000 4th Ave, Seattle, WA 98104
Guided subterranean walks amid ruins buried after an 1889 fire, including storefronts & sidewalks.
Address: 614 1st Ave, Seattle, WA 98104
Tickets: https://www.gatemastertickets.com/searcheventdayspan.aspx?selected=1&CompanyID=GM180&clear=true
A large Japanese grocery store
Address: 600 5th Ave S, Seattle, WA 98104
The Library has many free programs, events and services for kids and families. They offer story times in multiple languages for babies, toddlers and preschoolers.
Info: https://www.spl.org/programs-and-services/kids-and-families
Address:
A long winding community garden, has chickens
Address: 620 South Main St, Seattle, WA 98104
This is Brody's work!
You can take the Light Rail up to Capitol Hill Station (northbound from Pioneer Square).
While you are in Capitol Hill you could check out The Asian Art Museum, Volunteer Park, local shops on Broadway and Pike/Pine, or the mansions on Millionaire's Row.
Address: 810 E Roy St, Seattle, WA 98102
Menu: https://www.thefrenchguys.com/
If you want to go to Seattle Center (home to the Space Needle, Chihuly Glass Museum, The Children's Museum, The Pacific Science Center, and the International Fountain), you could take the Light Rail to Westlake station, and then transfer to the Monorail.
Brody and Mary live very close to Seattle Center, maybe we could even meet you.