I recently did nine months on royal caribbean cruiselines, in the caribbean no less! I was on the 2 largest cruise ships in the world, the freedom and liberty of the seas. It's true that your sight reading does have to be pretty good, mine was average but quickly got better, and you need to be pretty well versed in lots of different styles. Here are a few points to consider:
You will be sharing a cabin - I shared with the drummer, luckily we got on like a house on fire and we're still great friends
The cabins are tiny and you will be sleeping in bunk beds....
The food is average canteen food
there are strict uniform and passenger/crew 'interaction' rules
You will be playing the same shows every night. For at least 6 months....!
Good stuff:
You get to meet and play with some fantastic people
You do get a lot of time to yourself to practice and go sightsee the various ports
Great parties!!
Dancers.....singers.....
Pay should be around $1800 a month
Tax free....i think!!
Nothin better for your chops than playing in a pro setup night after night
Gettin paid to play bass halfway round the world and still gettin time to work on your tan ;-)
Best of luck, I highly recommend it!!!
Craig