After every day of angling- pull line from reel and respool the flyline onto the reel without any pressure so that the line doesnt hold memory.
Salt water Tip by Ant
"If you are planning a more complicated fishing adventure, especially to an exotic destination. I strongly advise working through a booking agent. A reputable agent can provide first hand knowledge on what to expect and can help you…the difference between a memorable trip and a tangled mess."
Chris Santella - Fifty Places to Fly Fish Before You Die