Walks are probably too numerous to mention. The majority of moorings have a footpath to or from them, and along the rivers.
If willing to risk taking the boat up Upton Dyke (very narrow and only a few moorings at the end) there is a nice walk through woods & fields that then brings you back to the village for a pint at the White Horse.
Moor at Gay's Staithe off Barton Broad and then walk to the boardwalk that takes you to Barton Broad itself.
Try mooring at Womack water then take the footpath past Hunters Yard for another circular walk back to Ludham village.
If down south, the walk along the river from Bramerton to Surlingham Ferry is pleasant if it's not too muddy!
Walk from Reedham Village to the Ferry
etc, etc! As I say, plenty of opportunity to stretch your legs! Hope you have a great time!