Cruises aboard Nautical Nature, a 37-passenger enclosed pontoon boat, include a 90-minute narrated tour of Lake Arthur, as sponsored by the Moraine Preservation Fund. Cruises are at 1 and 3 p.m. Saturdays and Sundays through Nov. 2. Tickets for adults are $11 online and $12 at the gate, for senior citizens, $9 and $10, and for children, $5 and $6. Children under 2 are free. Lunch, dinner and pizza cruises also are available. Call 724-368-9185 or visit www.morainepreservationfund.

A free Outdoor Discovery series, hosted by Butler County Parks and Recreation Department, will feature “Alameda Park — Butler's Disneyland” at 6:30 p.m. June 12 at the park's Carousel Shelter. Admission is free. Call 724-284-5383.

Star parties sponsored by the Amateur Astronomers Association of Pittsburgh will begin, weather permitting, at 8:50 p.m. Friday and Saturday at Nicholas E. Wagman Observatory in Deer Lakes Regional Park, Frazer Township, Allegheny County, near Russellton. Call 724-224-2510.