Hot Ticket: Forecastle: The Black Keys
Equal parts activism, arts, and music, this progressive three-day extravaganza on downtown Louisville's Riverfront draws 65 bands, numerous environmental nonprofits, and 20,000 fans. After-hours river raves take place on the steamboat Belle of Louisville.
Don't Miss The Black Keys, the New Mastersounds, and Appalachian folk rockers the Avett Brothers. Three days, $100; forecastlefestival.com.
Intermission Hike underground for hours in the limestone Mammoth Cave National Park (guided tour, $48; nps.gov/maca).
Crash Camp five miles away at American Turners Campgrounds, with alcohol sales and a shuttle ($50 for the weekend; forecastlefestival.com).