Titchwell Marsh (17 miles)

The RSPB Reserve is set-back from the beach and dunes by about 3/4 mile, just off the main coast road. There is a cafe, facilities and gardens. You can walk out through the reserve to one or two hides, overlooking the salt marsh and dunes, as well as to the beach. There are hundreds of birds at all times of the year.
Free to RSPB members, with small fee for other visitors. Can get busy, but is worth the walk out, with easy access to the vast beach at all tide levels.
https://www.rspb.org.uk/reserves-and-events/reserves-a-z/titchwell-marsh/