You've still got plenty of time, so I would start using one of the gradual tanners every day or second day, especially if you have dry skin. You should have a nice colour by the time you go and you can use it as aftersun when you're away too.
I'd recommend Garnier Summer Body Lotion Sun-Kissed which you can get in Boots or Superdrug in Light or Dark. I'm very fair and use Light, but the Dark isn't very dark so you won't go wrong with either. You can get the cream or the lotion and I use the cream on my arms and chest and the lotion on my legs, but that's only because I bought both when they were on offer and wasn't sure which would be better! Both are good! 