Here are a few places to try.
Blue Water Grill - this is my favorite and it has it all from fish to streak to chicken to sushi. It is right across from Union Square Park which is also a fun park. There are usuallystreet vendors in the park. This place is AWESOME!!
31 Union Sq. W.
(16th St.)
Manhattan, NY 10003
212-675-9500
http://www.brguestrestaurants.com/
Nicky's Vietnamese Sandwiches - This is a great inexpensive sandwich place.
150 E. Second St.
(Ave. A)
Manhattan, NY 10009
212-388-1088
Shake Shack - This is in Madison Square park, A great place to sit and people watch. The lines can get a bit long during lunch but they have awesome burgers and shakes. They are only open during the summer.
Shake Shack, Manhattan:Hamburgers --New York City
Madison Square Park
(23rd St.)
Manhattan, NY 10010
212-889-6600
http://www.shakeshack.com/
Sparks Steak House - A great old fashioned steakhouse. This place has a little history. Back in 1985 it was right outside Sparks that Paul Castellano was shot and killed by the Gotti family. It is a good neighborhood so don't worry.
210 E. 46th St.
(bet. 2nd & 3rd Aves.)
Manhattan, NY 10017
212-687-4855
http://www.sparkssteakhouse.com/
'ino - Great Italian and seafood
21 Bedford St.
(bet. Downing St. & 6th Ave.)
Manhattan, NY 10014
212-989-5769
http://www.cafeino.com/
If you want some good shopping then head to Soho. Broadway and Wooster streets.
Enjoy!