For $12, today's kayak-based side deal gets you a spot on a 90-minute twilight kayak tour offered by Jack's Boathouse (a $25 value). Jack's, which is tucked away under the Key Bridge at 3500 K. Street, is a family-owned-and-operated hidden gem. You can use a single kayak, tandem kayaks, or a three-person canoe for the tour. In the event of weather-related cancellation, you will get paddling credit.

Experienced guides navigate the Potomac, allowing boaters to calmly observe the Washington Monument, the Lincoln Memorial, and Adam Dunn. The twilight tour, which starts at 6:30 p.m., takes a relaxed pace around Roosevelt Island, an ideal location for viewing wildlife, before lazily floating on toward Fletcher's Boathouse for a sunset experience. The kayak trip from Jack's Boathouse was featured on the Travel Channel and written up in National Geographic Adventure. Reserve your spot for a Sunday, Wednesday, Thursday, or Friday twilight tour on Jack's Boathouse's Groupon page.

You must be at least 18 to rent. If under 18, you must be in a boat with a parent or legal guardian.

Reviews

National Geographic Adventure and the Travel Channel featured Jack's Boathouse:

• In under a mile, the Potomac morphs from a silent, tree-tunneled river into a bustling urban waterway. Jack’s Boathouse, by the Key Bridge in Georgetown, is a convenient jumping-off point for forays in either direction. Paddle upstream into what co-owner Paul Simkin calls the “wilds of Virginia” (watch for bald eagles), or ride the current a half hour downstream to take in the Washington Monument and Lincoln Memorial. – Catherine Price, National Geographic Adventure

Yelpers give it an average of 4.5 stars:

• Jack's is an awesome little mom and pop type kayak/canoe rental spot tucked away at the end of K Street under the Key Bridge. The people who work there are laid back and friendly...nothing better knowing that within minutes you can grab a kayak on a nice day... – Mimi L.
• the only place i kayak in dc. you would think georgetown [sic] wouldn't be the ideal place to find a cheap, laid back, fun place to be, but jack's figured it out. – aubri o.
• Picture yourself in a boat on a river, with tangerine trees and magnolia vines...Roosevelt island [sic], pillars of grey, towering over your head...It's the key bridge, and you are floating downstream in a kayak. – John B.