The Ballard Brewery district is one of our personal Seattle favorites, and we've spent many a date night and birthday celebration here! Our personal favorites: Great Notion, Urban Family, Reuben's, and Stoup (but there over a dozen breweries within a one-mile radius, so it's easy to hop around).
Worth the trek (a short drive or scenic bike ride) to the other side of Lake Union, Gas Works Park has one of the best views in Seattle! Note that this will be super crowded on the 4th of July because of the fireworks show, but definitely worth a trip on another day!