First up, of course, is the driving tour of famous locations from David Lynch's TV series Twin Peaks. Famously highlighting the Salish Lodge as "The Great Northern," this show borrowed from plenty of real locations. Maybe stop in to the Twede's Cafe for a "Damn Fine Cup of Coffee" and slice of "Twin Peaks Cherry Pie."
Take some time to hike around! There are several short trails to viewpoints near the Salish Lodge and one longer trail that leads to the base of Snoqualmie Falls. The steep 0.7‑mile trail pictured above is a popular option; see more details here: https://www.wta.org/go-hiking/hikes/snoqualmie-falls
Like trains? Visit the Northwest Railway Museum! The Northwest Railway Museum is the region’s largest railway museum with 5.5 miles of historic track and campuses. The Museum exhibits, preserves, restores, and operates trains on which the public can experience the excitement of a working railway. https://trainmuseum.org/