One week before you go is ok, your growth won't be too horrendous! Unless your nails grow at the speed of light.
I wore nails for years and did mine a week before we left too
I wouldn't recommend acrylic though, that is probably why Marina had so many issues. I would recommend some type of gel, there are a few different options. Even shellac can hold up better. Most salons won't even use acrylic anymore, well in Calgary anyways hehe