For those of you coming in early, I will recommend some of our favorite places to eat...
@PikePlaceMarket: Lowell's (quick service; grab an upstairs table an enjoy the view); Etta's (you can't go wrong with Tom Douglas fare); 3 Girls (quick service; Generous portions/ sandwiches)...
Seattle Art Museum Taste - fun happy hour food selection
Belltown/ 1st ave: Macrina (wonderful bakery, better coffee than Starbucks)
Belltown/ 4th ave: Dahlia (reservations recommended; another Tom Douglas delight); Lola (across the street, also a Tom Douglas)
Belltown/ 5th ave: Top Pot Doughnuts (large, dense doughnuts; excellent coffee); icon Grill (quirky but homey; reservations accepted)
Lake Union/ Eastlake: Serafina (on Eastlake; reservations recommended); Lunchbox Laboratory (burgers & quirky/fun decor); Blue Moon Burgers (quick service); Serious Pie (Tom Douglas' take on Pizza- there is one in Belltown, too); Cafe Vivace (across from REI; easily best coffee/espresso in Seattle, possibly beyond)
Pizza: if you are a pizza connoisseur it is worthwhile to trek to the Northlake Tavern & Pizza house southwest of the University of Washington (note they only seat 21 & up, but you can order to go).
Bagels: the best Bagels in Seattle come from Blazing Bagels, open weekdays and during ball games at the location on 1st at safeco field (open daily in Redmond and weekdays in Bellevue) - yes you can take their food into the ball games.
Family pub: Pyramid Brewery (across from Safeco Field) has a small area where they will seat under 21 for meals.
This is not intended as an exhaustive list - others may give you equally great or even more popular/heavily visited ideas. Enjoy Seattle while you are here. There will be some tough traffic with home games at both Century Link Field

and Safeco field on Saturday the 1st. Plus there is a game at 1pm at Safeco field on the day of departure which may impact late air arrivals (though I don't want to worry anyone

).
Whew that's a lot to read

but planning is at least half the fun!