When you can't go swimming (and the closest beach is Coney Island) most people flock to Sheep Meadow in Central Park for a little Vitamin D and a bronzed glow.
It's a 15 acre, plush green meadow with some of the best skyline views of the city. Sunbathers, picnickers, kite flyers and frisbee/football throwing juiced up jocks take up most of the open space on weekends. (Makes for some nice eye candy)
If you're too lazy (or lack the proper equipment in my case) to whip up a traditional picnic lunch - there is a giant Whole Foods, Jamba Juice and Starbucks just outside the perimeter of the park where the majority of people stock up on shareable snacks.
Bring a blanket (or an umbrella if you're a caveman like my cousin Kevin) and a good book (or good company) and soak up the rays before the inevitable rainy weather strikes up again (which it seems to do quite a bit this summer!)
Beware that the golden hue you seemed to have acquired during the day doesn't wash off in the shower... Last summer what I thought was a nice tan, faded before the day was through. I call it my "Smog Tan." Darn pollution.
But if you keep at it, eventually you'll start to darken, or at least you fool yourself into thinking you are.