I went a couple years back in December of January for brant. It was just me, guide plopped me in a blind and put out a couple decoys. Saw the prettiest sunrise ever and shot my limit of brant during it.
Guide then moved me over to a bufflehead blind. They are fun to shoot. Shot 6 I think and headed in.
Saw flocks of snows, black ducks, and lots more brants and bufflehead.
Chincoteague hunting and fishing center
Duckguide.com
I'd go back. Check out the website.
If you want to do snow geese, a couple bunches of birds did go into the permanent Decoy spread they keep out there. You might get a couple, it isn't like Texas or Saskatchewan.
The area is better for brant and diver ducks. Blacks are common on the Salt flats.