Until mankind first stepped outside in 1934, nature was thought to be a fanciful myth, like yogurt or the clutch hitter. Spend a few hours frolicking through the fresh air of truth with today's Groupon to Apple River Hideaway in Somerset, Wisconsin. Choose between the following options:

• For $12, you get one day of unlimited tubing for two people (up to a $30 value).
• For $58, you get two nights of camping and two days of unlimited tubing for two people (up to a $130 value, including vehicle charge and recycling fee). Tubing takes place Thursday–Sunday.

Every summer, Apple River Hideaway flourishes with inflatable adventure and tree-lined riverfront campsites. Take to the water on comfy inner tubes, floating over rapids, under a road bridge, and past beaver-dam zoning meetings. Expeditioners disembark at the Hideaway exit, following a trail to buses that will shuttle them back to the top of the river for another leisurely float. Each river-roaming session lasts three to four hours, giving tubers ample time to relax, take in the sights, or challenge fellow water loafers to an inner-tube hula contest. Day-trippers are sent home with happy memories and prune toes after 8 p.m., and campers can retreat each day of their stay to their own tent and cozy campsite, gathering around a fire pit to roast hot dogs, s'mores, and bad report cards.