I think it would be a good idea to add a bit of improbability to some places. For instance, (inspired by Waylander's idea here )
on a sea voyage from, say, Harmony Isle to Dhonal's Isle, on the boat you get attacked by some rogues, but somtimes on the same voyage that does not happen. It could or could not happen, by chance. Or even by date; if the voyage is undertaken on Day 8 nothing will happen,bt on Day 10 it will happen.