I’m not sure of your route, but if you’re passing through Delaware, there’s Bombay Hook and Prime Hook, both of which might be too far south from looking at a map but would offer a lot of birding. In northern DE, there’s White Clay Creek State Park on the DE and PA border, which I love, though I’m not sure mid-Feb. will show it at its best, and there’s Brandywine State Park. There are also serpentine barrens in the area, but I haven’t been to any of them, except Nottingham County Park long ago. I know they feature unusual plants, but it’s February, so . . . If the weather is really cold and snowy and you just want to remind yourself of beautiful gardens and summer, I suggest Longwood Gardens. They have a conservatory full of exotic plants, including some wonderful orchids. It’s all casual grade observations of course, but in mid-winter, it’s a relief from the bleakness of the outdoors. Have a fun, safe trip.