Stockton on Tees, (The Birthplace of Railways) the site has all mod cons and is part of a world class canoe course, its all good fishing since the Tees Barrage went in, a few mile away there are some non club spots near Yarm Bridge, with jetties and platforms, (but do check first as Clubs are a plenty here) plenty to do in the area also.
For info on fishing the river Spotty Dog tackle is a good place for advice, its in the Town Centre)
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Try Lucksall caravan park right beside the river wye , you can ask for a riverside pitch , i have caught Barbel to 13lb and chub to 7lb there is also Salmon and trout and some large Carp on some stretches , the pitches are large and flat ,you can also hire canoes and bikes , and its only 15 mins from Hereford town centre
Waveney River Centre in Norfolk - when we were last there you could fish the main river or the Marina, where my daughter caught a very big skimmer bream on her first fishing trip.
Also has a fairly good children's play area, a pub with a games room and a small swimming pool - although you do have to pay extra to use the pool.
Amazing family weekend with old steam engines, classic car displays, market stalls, and full catering and bar. And camping on site - Save £25 by booking in advance.