South west Norfolk?
Try the Dower House or the Thorp Farm (no facilities) Foristry site.
For a week plus I would go for the Dower House It is in the Thetford Forest area, good safe cycling, walking, river just the job for the average boy, but no sea!!
The site is between Thetford and Diss on a road off the A1066. If the area looks of interest let me know and I will find web site, phone ect. although I think a google enquiry should find it.
ttfn