Broads National Park
Good news – the Norfolk Broads now has national park status.
The Broads Authority website is full of information, whether you want to go boating or just visiting. Plenty of info about where to visit and things to do. Also lots of info about boat hire, boat trips and tides. http://www.broads-authority.gov.uk/
http://www.norfolkbroads.com/ has good up to date info on all things Broads related too.
Also see Visit Norfolk video on the delights of the Broads: http://www.visitnorfolk.co.uk/things-to-do/Boating-and-sailing.aspx