Where is it?
Most of the main attractions will be around the Inner Harbor, but you'll find installations in neighborhoods like Little Italy, Hampden, Federal Hill, the Bromo Seltzer Tower, and more. Here's the official map.
What's the best way to see everything?
Walking would be best, but it will get crowded on the weekends. Living Classrooms is having a cruise on Tuesday night to see the lights aboard their schooner, the Lady Maryland. There's also a ferris wheel at Rash Field for some good views of the Inner Harbor.
Where should I park?
By far the best way to get downtown is to use public transportation or to use Lyft/Uber. Both the Light Rail and Metro will get you close to the harbor, and both will have more parking available than you'll find on busy nights. If you don't mind the walk, the Little Italy garage on Central Ave is $4 for parking, which is hard to beat.