Remember when life was carefree? Keyword there being "free." Gone are the days of our parents footing the bill for our wily adventures, but then again gone are also the days of braces, puberty, and high school homework. Now that we're big, bad New Yorkers, let's expand our frugal horizons and make this Summer in NYC a creative, adventurous, outdoorsy, and most importantly, free one. From ping-pong in the park and a 5Pointz graffiti extravaganza to the New Museum block party and stargazing on the High Line, let yourself be a hot child in the city, but keep your money in the bank. Twenty ways say you can. Go ahead, enjoy your Summer . . . at no extra cost.