Unlike aerial tours of scenic landscapes, earthbound explorations let you engage a tree in a staring contest or challenge a grizzly bear to a thumb war. Revel in earthbound adventures with today's Groupon to Water-Dog Outfitter in Beaufort County, South Carolina. Choose between the following options:

• For $7, you get a hiking tour of Pinckney Island National Wildlife Refuge, offered at 8 a.m. on Wednesdays and 11 a.m. on Fridays (a $15 value).
• For $17, you get a cycling tour of Pinckney Island National Wildlife Refuge, offered Monday–Friday at 10 a.m. (up to a $35 value).

Water-Dog Outfitter equips explorers with the appropriate gear for a fun and educational escapade through the verdant, marsh-laden shores of South Carolina. Hikers can enjoy a leisurely journey with a 90-minute jaunt through the Pinckney Island National Wildlife Refuge, passing the island's salt marsh and woodlands while guided by an interpretive naturalist. The expert eco-guru will point out choice sights and provide informative tidbits for brains to nosh on, including the specific birthstones and surnames of passing egrets.

Saddle up on one of Water-Dog's comfy mountain bikes for a self-propelled, two-hour cruise around the wildlife refuge's wide paths and gently sloped terrain. Velocipedes glide through the island's diverse ecosystem as eyes sip on sights such as Ibis Pond—an ornithological paradise boasting bustling flocks of herons, egrets, and ibis mingling with other wildlife such as alligators and turtles at a weekly ice-cream social.

Though Water-Dog Outfitter sometimes features a discounted price online, this Groupon is still the best deal available.