Comment Twitter? (Score 1) 504
You might want to check out twitter.com. It has low bandwidth and works using mail and sms messages. You'll have to pare down on photos but it would be good to send snapshots and links to where you currently are.
Chances are the 100 minutes are for usig their PCs. (You might not get WLAN or laptop access for your machine. There's probably a business center where you'll have to do everything.
That being said do take a vacation from the net. If this is a good cruise you'll be too busy for sending hourly updates to the blog. :0