Summer's coming, and with it an onslaught of rooftop bar-hopping, specialty food trucks and bedbugs. The return of summer swelter also marks the return of tons of free activities designed to balance out our poolside craft beer habit, including one of our favorites, Summer Streets.

For three Saturdays in August (Aug. 4, 11 and 18) the city will close nearly seven miles of streets to car traffic from 7 a.m. to 1 p.m., giving New Yorkers plenty of room to bike, walk, rollerblade, practice yoga, etc. And this summer, the DOT has added something really exciting to the mix— a 160 foot zip line! DOT Commissioner Janette Sadik-Khan debuted a zip line demo at a press conference announcing Summer Streets today in Union Square (the real one will be located at the Foley Square rest stop at Chambers Street and Centre Street).

While we were told we'd be able to catch Sadik-Khan soaring high above the sidewalk in a hammocked harness, she apparently "rode it twice this morning," away from the prying eyes of curious photogs. But we still managed to catch a few brave souls trying their hand at urban zip-lining, and they all seemed to be having a grand old time, though one street side observer noted that "you'd have to be crazy…you could break your legs."

In addition to the zip line, this year's Summer Streets will feature a 25-foot climbing wall, free DOT-sponsored helmet fittings and free bike and rollerblade rentals; details about dates, streets and activities can be found on the DOT website.