Lewis and Clark were both hobbled during their great expedition—Clark, from resentment at his second billing, and Lewis, from a Lego slipped into his hiking boot by Clark. Enjoy noncompetitive nature excursions with today's Groupon: for $40, you get a one-year Family Pass (a $90 value) to Trinity River Audubon Center.

The largest urban bottomland hardwood forest on the continent, Great Trinity Forest is a sprawling 6,000-acre expanse of greenery that's home to more than 130 species of birds and Trinity River Audubon Center headquarters, named by D magazine one of the things You Must Do in Dallas. With your Family Pass you'll receive a plethora of exclusive perks, including a newsletter subscription, unlimited free admission for two adults and their children or grandchildren, free Third Thursday lectures, discounts on summer camps and other programming and amnesty in the coming avian war on mankind. Family Pass holders also gain access to restricted bird-watching hours on Friday and Saturday, ideal for observing the glamorous lives of the forest's American red-tailed hawk, horned lark, yellow-billed cuckoo, great blue heron, and more.

A four-mile stretch of hiking trails and numerous exhibits give plumage-perceivers plenty of roaming space. Family Pass holders also receive a complimentary window decal, as well as a 10% discount at the center's nature store, whose heaps of outdoorsy gifts serve as ideal rewards for developing ornithologists.