When the river wizard cursed canoes by shrinking them, he didn't realize the resulting kayaks would one day plunge through his mouth and dock in his small intestine. Join the never-ending fight against aquatic madmen with today's Groupon from Avid4 Adventure, featuring excursions in Golden, Highlands Ranch, Boulder, and Denver. Choose from the following options:

• For $39, you get admission for one to a half-day canoeing adventure (a $78 value).
• For $39, you get admission for one to a half-day climbing adventure (a $78 value).
• For $39, you get admission for one to a half-day kayaking adventure (a $78 value).

Avid4 Adventure leads junior explorers ages 5–12 and their parents on lively outdoor excursions throughout Colorado. Each adventure follows the wild wanderings of a pair of Avid4 instructors—certified in Wilderness First Aid, CPR, and small-craft canoe and kayak instruction—as they teach the nitty-gritty of their respective sports. Fill brain compartments normally tapped only by Navy Seals and Mountain Dew–commercial stunt doubles with safety precautions, paddle-stroke techniques, and capsize response on the canoe and kayak adventures, or learn correct body position and belaying on the climbing adventure. Parents are encouraged to pack lunches for ravenous rafters and should refer to the website for a list of things to bring. Excursions are offered May–October on Saturdays from 8:30 a.m.–11:30 a.m. and noon–3 p.m. Adventurers will receive details on exact locations and meeting points once they choose their program and book through Avid4 Adventure.

Children must be accompanied by a parent or adult 21 or older; this deal is valid for single admission, so an additional Groupon must be purchased for each participant seeking today's discount. A park or reservoir entrance fee of $5–$10 per car may apply to canoe and kayak trips, and is not covered in the cost of this Groupon. Your Groupon also entitles you to $30 off one summer day camp.