Puget Sound has islands that are served by Ferrys.. "£" says you are in UK.

These drive on - drive off ferrys ?

Going Generic, maybe a bike with 700c-32~37 wide tires .. Hybrid/Trekking = flat bars , Cyclocross/touring = drop bars .

So pick you a local shop, service after the sale is valuable. What brands do they sell? what is your budget?