Greenwood Furnace State Park, 15795 Greenwood Road, Huntingdon, 667-1800
The "Real" Trouble with Tribbles: Invasive Spe-cies, 7:30 p.m. Saturday, blacksmith shop.
Johnstown Flood National Memorial, St. Michael, 495-4643
"Journey Around Lake Conemaugh" van tour. Meet at the visitor center to join a ranger-guided van tour of the Johnstown Flood National Memorial, including the Clubhouse of the South Fork Fishing and Hunting Club and the ruins of the South Fork Dam. The one-hour tours start at 10 a.m., 1 p.m. and 3 p.m. daily. The tour is free with $4 park admission.
Path of the Flood Hike, beginning at 11 a.m. Sunday, meet at the visitor center. This is a 7 to 8 mile hike over uneven terrain. Participants should take water and a lunch or snack. This hike is free, but will be limited to 12 people. Reser-vations are required.
Prince Gallitzin State Park, 966 Marina Road, Patton, 674-1000
DiscoverE: Incredible Insects!, 9:30 to 11 a.m. Wednesday, meet at the pavilion at Pickerel Pond, for ages 4 to 5. Registration is requested.
Park History, 7 p.m. Friday, amphitheater. This is a slideshow presentation of the history of Prince Gallitzin and the park.
Intro to Disc Golf, 3 p.m. Saturday, Muskrat Beach No. 2, for all ages.
Meet the Planets, 7:30 p.m. Saturday, meet at Headache Hill. Take a blanket or folding chair and learn about the planets.
Skywatch, 8 to 9:30 p.m. Saturday, Headache Hill. Take a blanket or chair and binoculars for a view of the nighttime sky.
Library at the Lake, 10:30 a.m. Sunday, pavilion near the campground office. This program is for children ages 4-12, accompanied by an adult. This week's topic is animals that live in fields and meadows.
Nature at the Pond, noon to 2 p.m. Sunday, Pickerel Pond. The theme is "Trees Are Terrific!"
Geocaching with the Naturalist, 9 a.m. Monday, meet at Muskrat Beach No. 3. Some handheld GPS units will be available to borrow or bring your own to search for geocaches.
Nature at the Beach, noon to 2 p.m. Monday, Muskrat Beach No. 2. The theme is "Furs & Skulls!"
Shawnee State Park, 132 State Park Road, Schellsburg, 733-4218
Friday Night Hiking Series: The Field Trail, 6 to 8 p.m. Friday, meet at Picnic Area No. 2, Boat Rental Docks. This hike is 2 miles long over easy to moderate terrain. Wear comfortable hiking shoes and take plenty of water.