I made a day trip to St Helier from France. My advice is if in Jersey avoid St Helier. It is offshore Canary Wharf, nothing but shiny bank blocks and suited and booted bankers (female and male). The shops are all high price designer brands. I have never seen so many jewellry shops. Few restaurants, all expensive and the museums all have big boards outside listing all the banks donating to them - and then they charge £10+ for entry.
We did get a road train round the bay from St Helier, to St Aubin and the view changed. It was pleasant and relaxed.. Unfortunately as day trippers we did not have a car to travel any further, other than St Helier and the bay.
However the message I got was that now the bankers are bringing in the bucks those in charge in Jersey really cannot be bothered with tourists.