In reply to Anonymous:
Mac
You're spoilt for choice in Norfolk - it depends a bit what you hope to see I suppose. I'm just a visitor myself nowadays but I'll hopefully be able to shed a little light on your deliberations!
Snettisham can be good for waders when the tides are right - at low tide the mud stretches for miles and the birds will spread far and wide! The wader spectaculars depend on the right combination of time and tide to force the birds on to the inland lagoons - suggest you email the RSPB snettisham@rspb.org.uk for advice on whether your visit will coincide with favourable conditions.
. The reserve itself starts a bit unpromisingly - the car park adjoins small fishing lakes and there is quite a long path to get to the shoreline and the hides. Oh, and there are no facilities! Snettisham does get some nice sunsets - as despite being in the East it is a West facing coast - a golden sun on shimmering mudflats can be much prettier than it sounds ...
If you're based in West Norfolk then the Ouse Washes (RSPB) or the WWT at Welney are good to visit for wildfowl and especially whooper swans. Welney has a heated hide with big glass windows to watch the swan feeds through - could be welcome if the weather turns nasty!
But the jewel for West Norfolk I think is the invasion of pinkfooted geese. I lived in Sandringham for years, and some winter nights the flocks overflying were so large they interfered with TV reception! Birding spots abound along the A149 Coast road, Holme, Titchwell (RSPB), Holkham, Blakeney, Cley, Stiffkey .. Titchwell & Cley are the best known and most frequented, but I know many avow that Holme is better! Best to ask locally where & when to see the geese - depends a bit on tides - but generally it'll be just inland of the Coast Road between Hunstanton and Brancaster, or gathering in the mudflats of Snettisham.
If you're staying a bit further East in Norfolk it gets out of my old haunts - but I have enjoyed some good visits to the Horsey area - and Hicking Broad. I've only been to RSPB Strumpshaw in the summer for the swallowtail butterflies, and have yet to make Buckenham Marshes (also RSPB) - suggest you look at the main RSPB website reserve pages or hope someone else chimes in with more ideas..
Final word of advice- all coastal reserves can of course be quite bleak when the winds whip in off the sea - but wrap up extra well along the North Norfolk coast if there is a north wind, because there's nowt but sea between you and the North Pole!
I'm sure you'll enjoy your trip.