Where are you being taken to Hugginsc? You should propose when you think the time is right, so if it's on your birthday, then go for it. What's the ring like?
If you have been together for 6 years and she is taking you on holiday for your birthday, she no doubt loves you...im sure she will be over the moon..what a lovely suprise..im jealous lol ;O)
Contact your future in-laws and ask if you can speak to them privately on an important matter that concerns you all. When you do meet them, explain that you wish to ask their daughter to marry you and out of respect and love for them, you are seeking their blessing first. You promise to love and care for her to the best of your ability. I would see it as a term of respect for both her parents if you could included her mother in all of this, not just her father, although traditionally it would have been her father you asked for permission to marry.. but women are not *owned* by men anymore !
I've been thinking alot more about this, I know I still want to marry my girfriend, that has never changed, in fact I've been thinking about bringing the propsal date forward.