Hi cruising Brits,
For most of the table games such as blackjack and craps, the lowest chip denomination is US$5. The exception is roulette, where the chips cost US$1, and they usually require a minimum inside bet of $3 or $5. The most popular game is always blackjack where you will usually find some tables with $5 and some with $10 or $25 minimum bets. Don't lose all your quid on the first night at sea!