I am with the others here travellers Cheques are just an inconvenience these days stopped using them years ago.
Stick to cards and cash,
We usualy get money(£100+casino money) out at the airport on the way out and take our surplus $,eur from previous trips, when the local curency gets low get some more out from a cash machine or change a few £ localy, but try to use the Nationwide CC for as much as possible some days we only spend a few eur cash in port usualy local transport.
Onboard is cashless except for extra tips and the casino, so make sure you have CC to set up your account. If we do well in the casino we pay of the bill with that money.
As you are AI you won't need a lot, Spa,trips,shop,pay restaurant.