Everyone says it and we all mean it. Practice your casting before you go! Your guide is going to assess your casting ability in the first few minutes of your first morning together and following that will put you in situations that he/she thinks you can handle. So, if you haven't cast for a few months or have a new rod and don't quite have the feel of it yet you may drop the first cast at your feet. Nobody wants that to be their guides first impression of them!
Here's what we do. We go to a park near our house and line up surveyor's marker flags at 10 feet intervals, from 10 to 80 feet. We take the rods, reels and lines that we are going to be using on our upcoming trip and especially any new rods that we need to become familiar with. Once you are set up, tie a piece of brightly coloured yarn or practice fly to the end of your leader so that you can see if you hit your intended mark or not. Practice accurately casting out to various distances. Vary your practice by lining up your distance markers into the wind, with the wind at your back and crosswind. This will help you get ready for any situation. Once you have mastered casting for distance start working on accuracy. Place a Hula Hoop and Frisbee on the ground at spots you want to cast to and work at casting into the target. Move the target around to practice different distances and angles!