I've only been to the Channel Islands twice. Both about 25 years ago with work on Guernsey and Jersey. Both times had the long exhausting plane ride between the 2. They were pretty but an odd mix between tourism and banking. That combined with their location near France, the rather odd constitutional settlement, which was the reason for the banking, they had a sort of unreal air.
Preferred Guernsey of the 2. Had some good meals but haven't felt much inclination to return, since if I'm going that far lots of France is as easy to get to and is cheaper.