The free Outdoor Discovery program, hosted by the Butler County Parks and Recreation Department, at 6:30 p.m. today in the Carousel Shelter at Alameda Park will be “The Biddle Boys: Escape and Death of Butler County's Most Notorious Outlaws.” The program finishes the season.

Moraine State Park, Muddy Creek Township, will present “Bats in Action” from 7:30 to 9 p.m. Saturday at Zion Baptist Church, Route 528. Take blankets or chairs, and bug protection. The program from 2 to 3 p.m. Sunday will “Quick Frozen Critters” for children ages 5 to 12 at Pleasant Valley Beach on the South Shore.

Nautical Nature, a 37-passenger enclosed pontoon boat at Moraine State Park has trips on Lake Arthur. Cost is $35 for two people, $60 for a family of four. Reservations are required. Call 724-368-9185 or visit www.morainepreservationfund.org.

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

Star parties sponsored by the Amateur Astronomers Association of Pittsburgh are scheduled to begin, weather permitting, at about 8:10 p.m. Aug. 21 and 22 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 through September from 11 a.m. to 4 p.m. Wednesdays through Sundays. Interpretive tours are available at 1 and 3 p.m. Group tours may be scheduled by calling the Moraine Park office at 724-368-8811.