If you only had 1 day in Seattle, here are my recommendations:

1. Coffee at Elm Coffee

2. Check out the view from the top of Columbia Tower

3. Lunch at Kedai Makan

4. Head over to the Frye Art Museum

5. Walk through the Volunteer Park Conservatory or if it's nice out, kayak Lake Washington.

6. Dinner at Kamonegi

7. Evening stroll through Gas Works Park

8. Beers at Fair Isle Brewing and/or Sunset Tavern