We went about 4 years ago during their Tennerfest.i think that's what it was called. In October, I think. Lots of the restaurants put on meals at a reduced price often a tenner! We did a short 3 day package which included dinner at a choice of these establishments, some very up market.
Jersey reminded me of Cornwall. Some lovely walks. It is very small so you can have a cliff walk or a long, beside the sea walk. We were at St. Helier which has a huge sweeping bay. Everywhere is very clean I didn't see any rubbish. On our walk around the bay I was amazed how many public conveniences there were! No need to get caught short. I think this all reflects what a monied island it is.
It also has history. There is the huge hospital the Germans tunnelled out in the hills. Never used but ready to receive massive casualties. We also visited a lovely little church.