If you go to Pikes Market make reservations for lunch and eat at Matts in the Market. You can also take a passenger ferry over to West Seattle and enjoy Alki Beach. While you are there have some fish and chips at Spuds. If you can head up the hill to "the Junction" in W. Seattle have some of the Vashon roast espresso at "Coffee to a Tea with Sugar", its a coffee and cupcake house and is about the best one there is within 300miles.
I dont think Cap hill is worth the trouble these days except the single exception of Vivance. I am not a fan of Stumptown coffee but other people think they are great. They do have a public cupping at 3pm daily at their 12th ave location that is worth doing.
Pacific Place Downtown is a nice place to see once as well. The courtyard out front is a great example of a place where you can stand in one spot and see Different Starbucks Locations which is just nuts. In the center of that Vortex is Mobatta Crepes which is about as good as they get (can also twitter @mobatta) to let them know you love them and are coming for crepes. From Pacific Place you can take the monorail to the Space Needle area if you want to check out that area. If you go and end up there in the evening one of my favorite Martini bars in Seattle is Tini Bigs (my second favorite is Marcuses Martini Heaven in Pioneer Square) its well worth the visit for a $10 martini that you can cup in two hands.
If I think of more great things to do in the city ill post. If you want to follow me on Twitter while your here im at @jhoffpauir, Ill be at CF as well with Chef Stack so stop by and say hello.