Reverse skiing up a mountain is only possible during full moons on the summer equinox, which is why Rube Goldberg invented ski lifts. Push the button that tugs the pulley that tips the bottle that brings you today's Groupon for a skiing day trip to Hunter Mountain with Urban Sherpa. Trips jet off from the Walgreen's on Fourth Avenue in the East Village and the New Victory Theater in Times Square. Choose one of the following Groupons:

• For $60, you get two-way bus service to Hunter Mountain, a lift ticket, ski or snowboard rental, and a 90-minute lesson (a $120 value).
• For $42, you get two-way bus service to Hunter Mountain and a lift ticket (an $85 value).

Urban Sherpa assists thrill seekers yearning to explore gorgeous slopes by guiding them through adventurous outdoor getaways. Escape the banality of indoor living at Hunter Mountain, a quick 2.5-hour jaunt from the city, featuring snowy streams of verticals, moguls, and run-outs for experts and beginners alike. With the first deal, aspiring mountain-surfers can take advantage of Hunter's Learn-to-Ride center, where they'll be trained in the basics of skiing or boarding before practicing their new skills on one of Hunter's 14 trails specially designed for beginners and families. Beginners can also toss aside their makeshift skis made from jumbo popsicle sticks and get premium skis or a board for their day on the mountain.

Veteran winter-sport hobbyists with their own board or skis can use the second Groupon, good for a full-day lift ticket and a bus service to Hunter Mountain. Skiers from across the region flock to Hunter Mountain for its varied terrain, scenic views, and mustachioed squirrels carrying wooden pipes. Experience the thrills of skiing at a world-renowned resort with guidance from Urban Sherpa.