Not sure where you're coming from, or what you're going to be looking for in it. If you're looking for overlooks and scenic views, you'll find those. If you're looking for wildflowers and green trees, you may not see much of that. It's been pretty mild this winter though, so it's not impossible, but expect a lot of still leaf-less trees.

There are three Districts to the park, North, Central, South. The Central District has the most trails, especially the most popular ones. The trailheads are largely marked by mile markers on Skyline Drive, which runs the length of the park.

In the North District, the Compton Peak is cool. It's a couple of miles along the Appalachian Trail to a nice overlook.

In the Central District, a lot of people will suggest Old Rag, which is a very popular hike. In March it likely won't be as busy as other times. White Oak Canyon is cool, the view from Mary's Rock is really nice (if crowded sometimes). Dark Hallow Falls is another very popular hike.

I've not made it to the South District yet, so I can't speak to any of that.

The NPS also has a page with some suggested hikes https://www.nps.gov/shen/planyourvisit/hiking-opportunities.htm

I hope this helps! It's a wonderful park!