5K obstacle course challenges racers with 30-yard mud trench, wire bear crawl, and mud slide before party with free beer and live music

Groupon and Wrigley Field team up to show The Blues Brothers, with souvenir sunglasses, world record attempt, concessions & discount beer

A renowned dance company founded by modern-dance pioneers joins a Cuban composer and choreographer for a world-premiere performance

Experienced instructors teach scuba skills to diving novices

Text-message clues, trivia, and riddles lead explorers through Philadelphia's rich history

After quick training, guests harness themselves to certified instructors and soar around the skies in hang glider

Bicycles whisk sightseers through Central Park's 47 miles of trails; staffers hand out maps and suggest scenic and historic destinations

Naturalists narrate tours that enter habitats of humpback whales, fin whales, and white-sided dolphins

Kayak rentals embark from shores of Marsh Creek Lake, and bikers strap on supplied helmets to tour Valley Forge National Historical Park

Bustling horse farm hosts riding lessons in various disciplines in an open outdoor ring or airy indoor riding arena