Hello Wonderwall,
where do I start ? The East side of Potter Bridge is one of my favourite places on earth. Once under the bridge cruise beyond the bungelows and at Martham Development turn left towards Heigham Sound having admired their beautiful wooden cruisers and yachts ( airdraft of the cruisers typically < 6ft !!).
Enjoy the serenity of the river before turning up Meadow Dyke, signed to the right, where the narrow river winds for about a mile before reaching the glorious Horsey Mere. Look out for Marsh Harriers wheeling above you looking for food below. You may pass Ross who takes groups out on his boat on Nature Watches which are well worth doing and bookable from the staithe in Horsey. Make your way around the Mere and feel the stresses of life disappear. More as soon as possible after reaching the staithe on the LH side so that you can look back and admire the view. The best mooring is just after you reach Ross's river trip mooring. Be prepared to pay the Mere warden his £5 mooring fee if he is waiting near the shop, it is well worth it.
Having already prepared a picnic, walk along the staithe (good loos and a shower, tokens can be bought from the little shop, are at the end of the staithe on the left), over the road and follow the footpath straight over the fields, dog legging left across a style, then after a few hundred meters right onto a lane which turns into a rough track that leads after about 15 mins to Horsey Gap and its magnificent beach. Usually you will be one of very few on it and it runs for miles to right and to left. Very often there will be seals either swimming in the sea or on the beach a couple hundred of meters to the right, or both. I always take my trunks and a towel and swim here, whatever the weather, it is glorious !
Enjoy your picnic then follow the path back on to the road but this time keep going on the road until you reach the Nelson's Head on the right. I think in season it is open most of the time. It is one of my favourite pubs near the Northern Broads (if I were a cynic I might say that that does not mean very much !). It is totally unspoilt in a rural sort of way. The food is fine ,not brilliant, but as a place I love it. After your drink/meal, head back to the boat but on the way stop off at artist Peter Bearman's studio on the RH side. I have bought some wonderful watercolours of Broads scenes from him. They are not cheap but they have filled my house with happy Broads memories all year round. Back at the Mere, pop into the NT shop for an Ice Cream. It doesn't stock a huge amount but it is fine for a few basics and for souvenirs. As mentioned above the Mill has its sails of at the moment for restoration but I think that it is still possible to climb it for a small fee.
Back at the boat I would stay the night, maybe taking the pleasant walk beyond the staithe which skirts the Mere.
Next day I would retrace down Meadow Dyke ( after another walk to the sea and swim if so inclined) and I will continue later with what I would then do around Hickling. Sorry for being long-winded and tedious but, as you will tell, I quite like this area and have been going for decades !!
Best wishes
Charles