The middle of Suffolk/Norfolk is quite flat and not a large number of things to see apart from some large country houses.
I would however recommend a flight around the coast which is very pretty. The section from Ipswich Harwich Felixtowe North up to Lowestoft or the North Norfolk coast going west from Cromer along to Blakeney point. Both are very pretty and you can get some nice photos.
You can also go quite low over the sea as its easy to maintain 500ft horozontally when you're at 50 ft.
Stopping at the Tank Museum on the North Norfolk coast or Cromer (if you're OK with 495 mtrs ).
Old Buck has better facilities than Seething but both are a good base and fuel is available. You can also watch the parachutists at Old Buck.
I think Tibbenham are welcoming power pilots Skyhawk N is based there so can help.
It depends what you're looking for really.