Extreme urban kayaking, with its gnarly taxi rapids, precarious pigeon speed bumps, and incredible asphalt friction, is a sport reserved for only the elite adrenaline junkie. Experience the non-extreme version of urban kayaking with today's Groupon: for $7, you get a $15 kayak-rental voucher from Kayak Pittsburgh. Today's deal is valid on weekends only from April 30 to May 29 and October 1 to October 30, and on weekdays only from June 1 to September 30.

Kayak Pittsburgh, a project of the exercise-encouraging nonprofit Venture Outdoors, allows stream-splashers to navigate multiple routes from two river-course hubs in Pittsburgh. Select the downtown location for scintillating skyline views and under-bridge adventures, either solo ($15/hour and $8/each additional half hour) or in tandem with a recently discovered alter ego ($20/hour). Alternatively, for beginner-befitting boating, choose the scenic Lake Elizabeth location ($5/boat on weekends; free/weekdays), which measures just three feet deep. Before mimicking a human-mallard hybrid, prospective paddlers receive basic safety instruction and a life jacket and must sign a risk-acknowledgment form, including a guardian's signature if under 18. Kayak Pittsburgh uses flat-water kayaks, which are longer and much more stable than whitewater kayaks or emotionally tumultuous logs.

Kayak Pittsburgh has various seasonal promotions on weekdays that can be used in conjunction with this Groupon.