Decoy? behave! wrong sort of trails my friend.
There’s a lot of natural stuff at Haldon forest to be found, some of it loops along with the blue run, some with the red and loads is miles away.
Lustleigh cleave is a fun place to play and the mbr dartmoor killer loop are pretty good starting points as is this killer loop;
http://www.embc.uk.net/routes/killer_loop_dartmoor.html is ok
the nutcracker decent is rather amusing.