Go on a beautiful hike and see a beautiful body of water at my favorite hike. It is about 5.3 miles roundtrip with an elevation of 1,459 ft. It takes about 3 hours in total. There are restrooms at the start of the hike and parking is free.
Pike Place is a public market with a lot of good vendors. I highly recommend going to Le Penier, they have the best macaroons.
Not sure if it will be open in July, but the fairgrounds also have a lot of different events like concerts and rodeos.
Catch a Mariners game in the beginning of July.
Check out the Seattle Space Needle and the gorgeous view from the top.