The absolute best view of the lakefront.

I also noticed a nighttime Segway tour a couple of evenings ago. I have no idea of the route, but if it is the same as daytime, it should be pretty spectacular (Grant Park, Adler Planetarium, LSD, Northerly Island).

For someone with a car, the view from Montrose Harbor is pretty nice too. The view of the River from LSD is amazing, as is the view of the river from the bridge on Kinzie Street (walkable). There are also some great views from Halsted Street at about Chicago Avenue (Tribune printing plant).