Somebody was offering grass livery in the south of the island on the group a few days ago. In general I haven't heard many places to steer clear of. At most places facilities are fairly thin on the ground. I would avoid Cowes area just because there is hardly an hacking, places along the downs are the best for hacking but again, depends what you are interested in doing. Godshill is close to Lake Farm and Little Kennerley which are main competition venues and also have good hacking.