Belsay Castle and gardens are just 10 minutes away, and some of the nicest grounds i have ever seen. Roll on the spring.
The whole region needs to collectively co-ordinate an "inbound tourism" plan. Kielder water is totally wasted in my view. If that was the US and A, and it was done properly it could be our local Lake Tahoe. People will bulk at this sort of fairy tale thinking, which is actually the sort of approach that peoples like Americans apply to every facet of their lives. Think big, think collectively and think about a good plan. Easy money and lots of employment.