... and a few assorted areas for walking and photographing (in no particular order)
1) Times Square at dusk to night
2) A good one for weekdays: Wake up early, buy a cup of coffee, and ride the Staten Island Ferry back and forth. It's free and takes a little over an hour total. You'll be a part of the commuter culture. It's a good way to start the day and you'll get a distant but very nice view of the Statue of Liberty and downtown Manhattan. Afterwards, stroll around the Financial District and Wall Street. Then walk 30 minutes north to Chinatown and get lunch. After lunch walk back 15 minutes to the Brooklyn Bridge. Walk across the Bridge into the Brooklyn neighborhood of Dumbo for an amazing view of the city.
3) Central Park
4) On a weekend, start mid-afternoon by walking across the Williamsburg bridge from Manhattan. Off the bridge, walk north on the waterfront. You'll have a good view of the city. Continue walking along the water into Greenpoint. When the sun sets double back to Williamsburg and grab a pint in that neighborhood.