Alanna, I was thinking that the girl on the beach might be Ann-Catherine as she has medium blond hair. Also, she seems to be the one opening the door in jeans (same hair) in another spoiler pic. That coupled with the Quebec City pics (Ann's home town) lead me to believe she might be in the top three.
I also think Karen is in the top three based on the boat pic.
Mandy Jaye or Tara could be the other but it is unclear which one - looks like a fantasy date with a long haired blond.