I like Mitchell's, near Malpas (01829 720428), + Somerford and Smallwood are also great. Marian Bach is also very good, but further afield, in Caerwys. It's a shame Weetwood is now closed - probably because of Kelsall Hill's close proximity?
Anyway, stick with true horsey venues, run by horsey folk, not non-horsey farmers with government hand-outs, is my best advice!
somerford park is a wonderful hack, provided you can get your horse to walk through a streaam.
I nearly got a dunking in that stream when pony decided it would be fun to roll in the middle of it!