April the tables on Carnival are usually $5.00 minimum bet. On the first night they will normally have a special of $2.00 and $3.00 tables. I think the roulette tables have a special the first night also. If you are good at blackjack keep in mind many of the players on the ships have never played before and tend to not play well. This will not be in your favor. On my last Carnival cruise I sat next to a girl who would hit 13, 14, 15 or 16 against a dealers 2, 3, 4, 5, 6 but stayed on a soft 16 against the dealers face card. I finally had enough and left. Then you have the ones that split 10s even if the dealer has a 10.
At least with roulette table players have no effect on your betting.