since that is where I am and what I am most familiar with.
Starting up by Lake Erie and working my way south and then east a bit.
Presque Isle State Park
Tom Ridge Environmental Center
Erie Maritime Museum and US Brig Niagara
This is south and east of Erie
Kinzua Bridge State Park
This is a bit off the beaten track but is very popular, especially in the fall when the leaves change colors. And there is a family connection I forget how many greats, but a grandfather had a hand in building this. I can't count the number of times I've been here, most of them prior to the tornado destroying it. We would walk across the bridge and then walk back through the valley.
Pittsburgh
Point State Park
Heinz History Center
The Carnegie Museums (Art, Science Center, Natural History & Andy Warhol)
Pittsburgh Strip District; which has nothing to do with stripping. Lol This is a short stretch of restaurants etc.
You have to do one of the inclines.
Duquesne Incline
or the Monongahela (Mon for short) Incline
Gateway Clipper Fleet
They do Sightseeing cruises, Dinner cruises etc.
Pittsburgh is also home to the Pirates, PNC Park you can tour it. The Steelers Acrisure Stadium again tours can be arranged. And the Penguins PPG Paints Arena
Going east and a bit south depending on wat you want to do.
Laurel Highlands
For Ligonier, Fort Necessity National Battlefield, Flight 93 National Memorial, Johnstown Flood National Museum, Frank Llyod Wright’s Fallingwater & Kentuck Knob and the list goes on.