I'm flying through Moscow and have one day there. What is a must see and what are nice neighbourhoods to just walk the streets in? Any neighbourhoods to stay out of?
New Arbat Ave. It goes from near the river to 1 Red Square and is pedestrian only for quite a bit of it. The evenings are cool with vendors set up and several restaurants. Red Square has to be on your checklist. It is a long drive from either airport to center city, so watch your time carefully.
I found navigating the Moscow subway system difficult because of the language/writing. My taxi driver was good though and spoke English. Bring cash. Lots of it...