Moraine State Park, Muddy Creek Township, hosts an “Owl Prowl” from 7:30 to 9 p.m. Saturday at pavilion 6 at the McDanel's Launch area on the North Shore. A program on crayfishing is planned for 1 p.m. Sunday at the Davis Hollow Marina office on the North Shore. Call 724-368-8811.

Nautical Nature, an enclosed pontoon boat at Moraine State Park, has trips on Lake Arthur. Cruises are at 1 and 3 p.m. Saturdays and Sundays. Reservations are required. Call 724-368-9185.

Succop Nature Park, 185 W. Airport Road, Penn Township, has trails open from dawn to dusk. Visit www.aswp.org.

A Star Party sponsored by the Amateur Astronomers Association of Pittsburgh is to begin, weather permitting, at 7:50 p.m. Saturday at the Nicholas E. Wagman Observatory in Deer Lakes Regional Park near Russellton. Call 724-224-2510.McConnells Mill State Park, Slippery Rock Township, Lawrence County off Route 422, has the gristmill open from 11 a.m. to 4 p.m. Monday for Labor Day and the same hours Wednesdays through Sundays through September. Interpretive tours are available at 1 and 3 p.m. Tours for groups may be scheduled by calling the Moraine State Park office at 724-368-8811.