It's a Swainson's Thrush!
The Catharus thrushes (Veery, Hermit, Gray-cheeked/Bicknell's, Swainson's) can be a tricky group to separate visually. This bird lacks the reddish overall upperside color of a Veery, and doesn't show strong red in the tail, which rules out Hermit. That leaves us with Swainson's and Gray-cheeked/Bicknell's. The latter pair are essentially identical visually, which is why I treat them together, although Gray-cheeked is much more expected in PA than Bicknell's. The key field mark here is the buffy "spectacles," which is a Swainson's characteristic.
Another clue is the timing and habitat. The bird is not in breeding habitat for any of the species, which suggests it is likely a migrant. Hermit Thrush is an early migrant, and should be on breeding grounds by May, especially later in May. Swainson's and Gray-cheeked are both later migrants, which matches up with the timing, but Gray-cheeked tend to be more secretive, and mostly stick to deeper woods, not a path in a public park. So, adding everything up, it makes for a solid Swainson's.
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