A new offer from Indiana State Parks makes weeknight camping more affordable during September. People who book a new reservation for one or more weeknights during the month will receive 20 percent off at the time of booking. The offer applies to all State Parks & Reservoirs campgrounds. Reservations can be booked at camp.IN.gov or by calling (866) 622-6746. The reservation must be booked and used by Oct. 8. Use the promo code “CAMPIN14.” The offer does not apply to reservations made in combination with any other discount or offer. The offer does not apply to walk-in registrations. The offer excludes Labor Day weekend.