The campus is large and quite pleasant to walk around. If it is a sunny day the view from Red Square of Mt. Rainier is really impressive and should not be missed. The graduate reading room in Suzallo Library is also spectacular -- will make you think you are in Europe.
The Burke Gilman trail bisects campus, and you can walk either east/north, eventually ending up along Lake Washington, or west along the canal over to Ballard. Walking west a couple of miles brings you to funky Fremont, which is a fun place to hang out (though i haven't hung out there since the 1990s....)
There are tons of restaurants in the neighborhood, mostly fairly low cost (and often quality to match, unfortunately). We had great Indian food recently at Shalimar. The gyros and falafel at Aladdin are good. My bibimbap at Korean Tofu House was too sweet for my taste, but the tofu soup my friend had looked good. Cafe Solstice has great coffee, though Cafe Allegro is the place my DH still prefers to go (grad school memories...).
I typically drop DS off on campus around 8:00am and if the weather is not bad could pick you up for a walk or hike in one of the local parks that are further from campus, or even further afield. Have room for up to four people in the car (though the back seat would be a bit cramped with 3 adults) if any other Mustachians would like to join.