Grand Cayman does have a nice population of bonefish! I was there in May 2007 but was only able to fish for one day and it was raining. However, in the back flats we saw lots of mudding bones but they were deep. There are basically two guides on the island with fly fishing experience and I would recommend Captain Ronald Ebanks, Cayman’s most experienced fly fishing guide and he has a really nice skiff boat. http://www.flyfishgrandcayman.com, email is flyfish@candw.ky. Feel free to PM me if you have specific questions.