Central Park
Did you really think I wouldn’t include Central Park? Running from 59th St to 110th St, this park has endless spots for lying out, both public and hidden. Try Sheep Meadow, a 15-acre stretch (b/w 66th St and 69th St) where you can lay out, have a picnic, play Frisbee or watch cute puppies run around. They even have wifi available! Also check out the East Green (a designated quiet zone b/w 69th St and 72nd St), Cedar Hill (b/w 76th St and 79th St), the Great Lawn (55 acres b/w 79th St and 85th St), the East Meadow (b/w 97th St and 100th St), or any other spot you can find.
Central Park, north to south from 110th St to 59th St and east to west from 5th Ave to Central Park West, NYC (see map here).
[Photo via @erin_marie_ob]