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You can watch the fireworks display from anywhere on the Pier. Booze and live music of varying quality are available at The Beer Garden (+1-312-595-5439, summer W-Sa to midnight, Su to 10PM).
Easy to miss, as it's on a side street without much in the way of signage (or advertising), but this gallery has a long history — it opened in 1916, and hosted Pablo Picasso's first art show in the U.S. Visitors will find three public art shows each year, usually of exceptional quality. Note the Mies van der Rohe central staircase, which was transplanted from the club's previous Mies-designed location.
A small museum spread over the five floors of the southwest tower of the Michigan Avenue Bridge. Visitors can see displays on the history of Chicago's famously abused river, and also check out the machinery used for raising the bridge. Tower tours are Fridays and Saturdays at 11AM and 2:30PM beginning in June, book online. The bridge lift times depends on tides, but is usually between 10AM and 1PM on W and Su.
Adorning the first floor are decorative arts from the collection of the museum's namesake, Richard H. Driehaus, with plenty of Tiffany stained glass. But it's the restored 1883 mansion itself that garners glowing reviews; inside are 17 different types of marble, hand-painted ceilings, carved exotic wood wainscoting and other marks of superior 19th-century craftsmanship. If you're interested in historic architecture and interior design, this is still a hidden gem without crowds.
Hancock Observatory
360-degree view from the 94th floor. Not quite as high as the Sears Tower Skydeck, but with a better view, and from January to March, an ice-skating rink! For drinks, see the Signature Room below.
Chicago Red Line
Right next to the Water Tower, LUMA is best known for its exhibits on sacred art and architecture, but it occasionally veers into modern art as well, such as an installation of Andy Warhol's silver balloons.
No tours available, unless you're cheeky enough to fill out a fake rental application (24 hours in advance), but these iconic twin buildings are worth a photo. (You might recognize them from the cover of Wilco's Yankee Hotel Foxtrot, among many others.) Designed to be "a city within a city," they include a wildly overpriced bowling alley and the House of Blues (see Drink below). If you like Marina City, be sure to visit the South Loop for two more of architect Bertrand Goldberg's corncob structures.