I would check out the tutorial videos at the
Lumiquest Wesite.
Yes, he's trying to sell light modifiers, but the information is the absolute gospel of light. Particularly check out the myths and misconceptions videos. Then, I would look around you local camera stores and see if they have one of the "flying nun" bounce devices, I think that will help you a lot out in the woods.
Also, shoot with the camera in manual, and try setting your flash EV comp to -1. Use a slower shutter speed to get some ambient light in your photos if they start to look too "flashy". Once you find the right exposure it will be reproducable shot after shot because you are in manual mode.